2003 GMC Sierra 1500 Transmission Parts

Below you will find various in-demand GMC Transmission Parts, components and accessories for your 2003 Sierra 1500. Advance Auto Parts has popular Sierra 1500 parts like Transmission Mounts, Automatic Transmission Pan and Gaskets, Transmission Seals and more. You’ll also find aftermarket and OEM Transmission Parts for other Sierra 1500 model years including 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022 and more. Select a category of 2003 GMC Sierra 1500 Transmission Parts below and start saving instantly.

Please Select your Vehicle to See Exact Fit Parts

Popular 2003 GMC Sierra 1500 Transmission Parts Categories

Gear Shift Levers

Automatic Transmission Shift Linkage Bushings

Automatic Transmission Oil Temperature Sensors

Transmission Torque Converters

OE Transmission Coolers

Automatic Trans Shifter Cable Levers

Torque Converter Hardware

Transmission Control Module Bolt

Transmission Solenoids

Transmission Oil Cooler Lines

Transmission Shift Cables

Automatic Transmission Torque Converter Clutch Solenoids

Automatic Transmission Shift Solenoids

Transmission Pan Gaskets

Output Shaft Speed Sensor Connectors

Automatic Transmission Drain Plugs

Shift Interlock Solenoids

Transmission Oil Cooler Fittings

Automatic Transmission Line Connectors

Pinion Bearings

Transmission Mounts

Transmission Oil Pans

Transmission Master Repair Kits

Transmission Oil Pressure Switches

Back Up and Neutral Safety Switches

Transmission Rebuild Kits

Transmission Oil Pan Gaskets

Automatic Transmission Wiring Harness

Speed Sensors

Automatic Transmission Differential Bearings

Transmission Speed Sensors

Main Shaft Bearings

Automatic Transmission Output Shaft Seals

Transmission Temperature Sensors

Automatic Transmission Oil Pump Seals

Pinion Seals

Neutral Safety Switch Connectors

Transmission Seals and O-rings

Back Up Light Relays

Back Up Light Switch Connectors

Torque Converter Seals

Extension Housing Seals

Manual Transmission Output Shaft Seals

Automatic and Manual Transmission Shift Boots

Automatic Transmission Wiring Harness Connectors

Shaft Seals

Transmission Shift Kits

Input Shaft Bearings

Back Up Lamp Connectors

Transmission Bands

Manual Transmission Main Shaft Seals

Automatic Transmission Flexplate Mounting Bolts

Automatic Transmission Output Shaft Bearings

Shift Shaft Seals

Automatic Transmission Oil Pump Gaskets

Manual Transmission Shift Fork Inserts

Remanufactured Automatic Transmissions

Manual Transmission Cluster Gears

Torque Converter Bearings

Automatic Transmission Output Shaft Seal Kits

Transmission Control Module Connectors

Parking, Neutral, and Back Up Lamp Switch Connectors

Essential Transmission Parts for 2003 GMC Sierra 1500s

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$69.99

AT PRESS SW MANIFOLD

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$33.99

This shift interlock solenoid is designed to match the fit and function of the original solenoid on specified vehicles, and is engineered for durability and reliable performance.

Product Features:

Direct replacement – this shift interlock solenoid is designed to match the fit and function of the original solenoid on specified vehicles
Ideal solution – this solenoid is a reliable replacement for an original part that is damaged or has failed due to fatigue, excessive heat or electrical current
Durable construction – this solenoid is made from quality components to ensure reliable performance and a long service life
Trustworthy quality – backed by team of product experts in the United States and more than a century of automotive experience

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$173.99

Remanufactured using industry-leading techniques to assure enhanced torque performance and extended life. Each unit is harmonically balanced and leak tested with any inherent OE weaknesses corrected. Pro-King torque converters are subject to random ISO 9001 quality tests before leaving the factory.

Product Features:

Meets or exceeds OE specifications

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$34.99

ATP Reusable OE Style Automatic Transmission Oil Pan Gaskets offer ultimate sealing performance. Their unique sandwich style construction consists of an inner metal rib surrounded on both sides by molded rubber. This combination offers the ultimate in sealing performance.

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$9.99

Product Features:

Brand may vary by location

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$48.49

Bracket and Lever Kit for TH-350, 400, 200, 700-R4, 4L60E and 200-4R transmissions.

Product Features:

Incl. Cable Bracket/Shift Lever/Spacers
Incl. Swivel/Cotter Pin
Natural Finish
Sold as a kit
Replacement part

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$4.99

Motive Gear offers some of the toughest drive train components on the market today. If you are looking for the largest line of performance ring and pinion gear options available with gear sets in a wide range of ratios for nearly every application, both on and off-road, check out Motive Gear. Motive Gear products can be found in the winner’s circle at racing events worldwide. The superior quality of Motive Gear components is the result of years of racing development, outstanding design and state-of-the-art manufacturing methods. Extensive testing is performed on all products by our in-house engineers.

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$56.99

Shift Solenoid

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$47.99

Delphi’s ever growing portfolio of high quality vehicle sensors are backed by stringent OE development and product validation methods. We offer a wide range of sensors, including ABS, camshaft, crankshaft, knock, EGT, MAP, temperature, throttle position, and vehicle speed sensors for a variety of vehicle applications. All of our sensors are tested and calibrated to OE standards, ensuring accurate readings, which helps to reduce comebacks.

Product Features:

Manufactured to meet or exceed OE requirements
Not impacted by temperature changes
Provide robust, long lasting sensor protection
Designed digital output for maximum signal to noise ratio

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$24.49

ATP Transmission Seals And Gaskets are exact fit, no compromise replacement parts

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$32.99

This transmission shift boot matches the fit and function of the original equipment boot that as become damaged or missing. Made of quality materials, this boot is designed for durability and has been validated for a proper fit.

Product Features:

Ideal replacement – this transmission shift boot matches the fit and function of the original equipment boot for specific makes and models
Durable materials – this shift boot is manufactured from quality materials for durability
Cost-effective solution – offers original equipment quality at competitive price
Quality tested – this part has undergone try-on testing to ensure a quality fit

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$11.99

Fel-Pro gaskets offer 100% vehicle sealing with application-specific materials to give you sealing solutions with the performance and durability professionals trust.

Product Features:

Meets or exceeds all original equipment specifications
Application specific design to ensure a perfect fit
Unsurpassed quality you can trust
Validated for fit, form and function
Each Fel-Pro gasket, no matter how small, is engineered to exacting standards with proprietary design, engineering and manufacturing processes

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$6.99

Our wheel seals are engineered using only the highest-quality materials to meet vehicle manufacturer specificatons. We work with suppliers to design seals that meet FAG’s quality standards. Seals are designed to protect wheel end components from contamination – such as dirt, dust, and moisture – and prevent the loss of grease over the life of the bearing. The specifications for wheel seals are very demanding, and the type required depends on the specific application, position and vehicle class.

Product Features:

High-precision and High-quality components used in all KITs
Coverage of classic and new high-tech solutions for the best system coverage

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$43.99

Modern vehicles may have 100 or more electrical harness connectors in every operating system of the vehicle. Terminal tension may weaken with time or corrosion may occur within the connector housing making replacement necessary. When replacing any harness-connector assembly approved wire termination methods must be followed to ensure a successful and long-term solution to the original problem is made. A failed terminal connection, terminal corrosion or damaged wire will result in an electrical system fault.

Product Features:

Carquest electrical connectors meet or exceed OE wire gauge, insulation, and terminal material requirements.
WVE electrical connectors meet or exceed OE wire gauge, insulation, and terminal material requirements.
Product constructed to meet all design and operating characteristics as intended by the manufacturer.
OE specified wire gauge to ensure a reliable electrical connection
Designed to meet or exceed OE specifications in form, fit and function

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$59.99

Carquest electrical connectors meet or exceed OE wire gauge, insulation, and terminal material requirements.
Sealed connections (where applicable) to prevent environmental corrosion and performance issues
Global coverage for import and/or domestic applications
OE specified wire gauge to ensure a reliable electrical connection
Designed to meet or exceed OE specifications in form, fit and function

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$99.99

GM Genuine Parts Parking / Neutral Position and Back Up Light Switches are designed, engineered, and tested to rigorous standards, and are backed by General Motors. GM Genuine Parts are the true OE parts installed during the production of or validated by General Motors for GM vehicles. Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE).

Product Features:

Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE)
GM Genuine Parts are designed, engineered and tested to rigorous standards, and are backed by General Motors
GM Engineers design and validate OE parts specifically for your Chevrolet, Buick, GMC, or Cadillac vehicle
GM regularly updates production and service part designs to integrate new materials and technologies

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$10.49

This transmission drain plug is designed to match the dimensions and function of the original plug on specified applications. Made of quality materials, it is engineered for reliable performance and durability.

Product Features:

Direct replacement – this transmission drain plug matches the dimensions and function of the factory hardware on specified vehicle years, makes and models
Ideal solution – this drain plug is a reliable replacement for an original part that is damaged or lost during service
Durable construction – this part is made from quality materials to ensure reliable performance and a long service life
Quality assured – backed by a team of product experts in the United States and more than a century of automotive experience

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$35.99

You can forget about the problem of shearing a torque converter bolt after you install these super strong 200,000 PSI gems. They are designed for each specific application and provide the optimum grip. Kits come with hardened parallel ground washers.

Product Features:

Super Strong, Rated At 200,000 PSI
Kits Come With Hardened Parallel Ground Washers
Made In USA
0.590″ Underhead Length
M10 X 1.5 Thread Size
Set of 6

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$429.99

aFe Powers new deep transmission pan brings performance engineering to the protection of your trucks transmission. This transmission pan has additional capacity for 2 more quarts over stock at the factory line, a magnetic drain plug and a 1/8″ NPT port for your temperature sensor. Built-in internal and external fins transfer heat from the fluid to the outside air for maximum cooling. This transmission pan is constructed out of durable die-cast A356 aluminum with reinforced ribs and a wrinkle black powder-coating for maximum strength and styling.

Product Features:

Internal/External Fins Transfer Heat From Fluid To Ambient Air
Large Neodymium Magnet Drain Plus Captures Loose Particles
1/8 in. NPT Port Comes Ready To Use For Your Temp Sensor
Comes Complete w/All Necessary Hardware To Bolt Directly On

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$561.99

ATP Master Repair Kit Plus contains friction And steel clutch plates, gaskets, seals, o-rings, sealing rings, sump filter, And commonly replaced bushings required to high quality transmission rebuilding.

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$12.99

ATP Transmission Seals And Gaskets are exact fit, no compromise replacement parts

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$70.99

The Imperial Maxi-Cool XL’s plate and fin design offer excellent cooling efficiency in a compact, space-efficient design.

Product Features:

Imperial Maxi-Cool plate and fin transmission cooler
Size: 3/4″ x 11″ x 7-1/2″
Mid-size and full-size cars, pickups
GVWR up to 20,000 lbs.; towing up to 2,500 lbs.
Compatible with OEM cooler systems
Made with the highest quality materials
100% pressure testing to 150 PSI for quality assurance
33% more efficient than a comparable tube and fin design

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$45.99

National has built a reputation as one of the most respected names in the industry. We have offered premium sealing solutions for more than 75 years. Our design team keeps pace with the industry and provides advanced solutions for today’s vehicles.

Product Features:

Designed to repair damaged, grooved or worn shafts
Durable stainless steel construction for corrosion-free sealing surface that surpasses most original shaft specifications
Ideal for a shaft where indications of seal wear, such as tracks or grooves have developed
Ultra-thin construction (0.01/0.25mm wall thickness) allows original seal size to be used with minimal additional lip loading
Easy to install with removable flange and installation tool

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$32.99

The Automatic Transmission Fluid Temperature Sensor provides an input to the transmission control module as to the operating temperature of the automatic transmission fluid under the many operating conditions. The transmission control module will provide the transmission hydraulic circuits the optimal fluid pressure for current temperature conditions.

Product Features:

Product constructed to meet all design and operating characteristics as intended by the vehicle manufacturer.
100% thermo-shock and vibration tested to ensure superior performance in extreme conditions.
100% end-of-line tested to ensure accurate signal output providing product reliability, every time.
Tin plated lead frame prevents corrosion and ensures a reliable terminal connection under adverse ambient conditions.
Lead frame terminal size and location determined using image dimension measuring system or 3D laser scanner.
Application matched components ensures system operation in like new condition.

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$28.99

Flywheel and flex plate bolts play an important role in the performance and safety of race cars and street machines alike. That is why the fastener experts at ARP have developed special bolts that are far superior to OEM hardware. ARP offers two styles of flywheel/flex plate bolts: High Performance and Pro Series. They are both forged from aerospace alloy and heat treated prior to thread rolling and machining. Both feature an exclusive, flat, 12 point head design and larger than stock shank diameter for increased strength and improved flywheel register. The popular High Performance series is rated at 180,000 PSI, and the premium grade Pro Series, originally developed for NASCAR competition, has a 200,000 PSI rating. Complete with washers and nuts where applicable.

Product Features:

Forged From Aerospace Alloy And Heat Treated Prior To Thread Rolling And Machining
Feature An Exclusive, Flat, 12 Point Head Design And Larger Than Stock Shank Diameter
Flanged Nut
Increased Strength And Improved Flywheel Register
Chevy 90░ V6 & 265-454 With 2-pc Rear Seal, Ford 289-460
0.68″ Underhead Length
200,000 PSI

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$35.99

Manufactured with premium-grade steel, National taper bearing sets feature crowned raceways and rollers to ensure even load distribution.

Product Features:

CONSISTENT PERFORMANCE: Matched cup and cone components ensure consistent performance
PREMIUM MATERIALS: Precision manufactured using premium-grade steel for outstanding durability and performance
SMOOTH ROTATION: Crowned raceways and rollers for even load distribution
OE-STYLE DESIGN: Engineered to meet OE specifications
COMPREHENSIVE COVERAGE: Industry-leading coverage for domestic and import applications
RIGOROUS TESTING: Comprehensive testing throughout design and development processes by National engineers for quality you can count on

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$11.79

ATP Transmission Seals And Gaskets are exact fit, no compromise replacement parts

Upgrade your 2003 GMC Sierra 1500 with Top-Quality Transmission Parts

When it comes to maintaining or upgrading your 2003 GMC Sierra 1500, nothing is more important than using high-quality OEM or aftermarket parts that you can trust. Whether you’re repairing damage to your GMC or enhancing its overall performance, Transmission Parts are key to keeping your Sierra 1500 functioning at its best. At Advance Auto Parts, we offer a wide selection of 206 Transmission Parts for the 2003 GMC Sierra 1500, designed to meet your needs without breaking the bank. From Transmission Mount replacements to Automatic Transmission Pan and Gaskets upgrades, we’ve got you covered with parts that fit your vehicle perfectly and ensure long-lasting performance.

Affordable Prices and Wide Selection

Shopping for Transmission Parts for any vehicle can be a hassle, especially if you’re on a budget. But with Advance Auto Parts, you can find high-quality Transmission Parts for your 2003 GMC Sierra 1500 at great prices. Our Transmission Parts inventory for this model ranges from just $3.99 to $4,715.99, with an average price of $319.36. Our 206 Transmission Parts in stock come from 29 trusted brands, so you’re sure to find the right part for your 2003 GMC Sierra 1500 without overspending.

Top Brands and High Customer Satisfaction

Advance Auto Parts takes pride in offering only the best brands in the automotive industry. For your 2003 GMC Sierra 1500, we stock popular OEM and aftermarket Transmission Parts from top names like National, Imperial, Pro-King, and more. National Transmission Parts start at just $6.99 and boast an impressive 4.3 stars average rating from customers. Imperial and Pro-King also bring quality to the table, with Transmission Parts available starting at $27.49, and at an average 4.1 stars rating. With 15,862 customer reviews and counting, our 2003 GMC Sierra 1500 Transmission Parts have a strong track record of reliability, ensuring you can trust your purchase.

Explore Related Parts and More

While you’re here, don’t forget to check out other essential categories that go hand in hand with Transmission Part upgrades. Explore related part types like Batteries and Chargers, Oil and Lubricants and more to make sure your 2003 GMC Sierra 1500 is always ready to roll. We’re committed to providing you with everything you need to keep your Sierra 1500 in top shape, all in one place. Start shopping confidently below for your 2003 GMC Sierra 1500!

Best-Selling Transmission Mounts for 2003 GMC Sierra 1500s

Enhance the driving experience in your GMC with 4 quality Transmission Mount components, starting at $18.99.

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$18.99

Anchor 2811 This mount supports the transmission and dampens vibration. Each mount is specifically engineered and designed to OE standards. Natural and SBR rubber provide maximum life and performance. Steel fasteners are heat treated grade 5 bolts. A special bonding agent is used to ensure a rubber to metal bond. Rubber material is mixed to specific Durometer, hardness.

Product Features:

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$28.49

Anchor 2638 This mount supports the transmission and dampens vibration. Each mount is specifically engineered and designed to OE standards. Natural and SBR rubber provide maximum life and performance. Steel fasteners are heat treated grade 5 bolts. A special bonding agent is used to ensure a rubber to metal bond. Rubber material is mixed to specific Durometer, hardness.

Product Features:

MAXIMUM LIFE & PERFORMANCE: Both natural and SBR (Styrene Butadiene) rubber provide good abrasion resistance and aging stability to ensure maximum life and performance.
MEETS OR EXCEEDS DUROMETER MEASUREMENTS: All rubber material is manufactured to specific Durometer (hardness) measurements based on the vehicle’s application requirements.
HARDENED STEEL FASTENERS: All fasteners are made of hardened steel with heat treated Grade No: 5 bolts.
SUPERIOR BOND: A special Chemlok bonding agent is used to ensure a superior rubber-to-metal bond.
HYDRAULIC MOUNT DESIGN: Hydraulic Mounts (applicable where OE) are designed for most front wheel drive vehicles because transverse drive train mounting.
For Years: 1982-2019
Weight approx: 5 Lbs.
Studs: M10-150
Interlock
Bolt Holes Centerline: 7.5 Inch / 190.5 Mm
This mount supports the transmission and dampens vibration.
All mounts are specifically engineered and designed to OE standards using the latest CAD/CAM engineering process ensuring the highest consistency and quality.
Only natural and Styrene Butadiene rubber is used to provide premium abrasion resistance and aging stability to ensure maximum life and performance.
Any included fasteners are hardened steel with heat treated Grade No: 5 bolts.
All Rubber material is manufactured to specific Durometer (hardness) measurements based on vehicle application requirements.
Hydraulic Mounts, applicable where OE, are specifically engineered for high vibration and torque applications and are filled with special hydraulic fluid to dampen excess noise and vibration.

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$48.99

Hooker continues to set the standard of performance with the BlackHeart line of drivetrain components. These BlackHeart transmission mounts are constructed of durable polyurethane to handle the stress and vibration of high horsepower applications while still lasting longer than rubber mounts. Our 3-hole design allows multiple mounting options for factory chassis or custom hot rod applications and features a unique built-in safety lock to keep from separating under high torque loads. Fits 1 or 2-bolt GM and Jeep applications.

Product Features:

Durable polyurethane to handle the stress of high horsepower
Same durometer as other BlackHeart and Hooker poly mounts
Can be used in place of 1-bolt or 2-bolt mount
Absorbs vibration and last longer than rubber
Ideal for use on street or strip applications
Molded indentions for socket clearance to ease installation
Complete with Grade 8 mounting hardware
Bolt Spacing on the Wider Side: 4-inch
Bolt Spacing on the Narrow Side: 1.5-inch

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$44.99

Hooker continues to set the standard of performance with the BlackHeart line of drivetrain components. These BlackHeart transmission mounts are constructed of durable polyurethane to handle the stress and vibration of high horsepower applications while still lasting longer than rubber mounts. Our 3-hole design allows multiple mounting options for factory chassis or custom hot rod applications and feature a unique built-in safety lock to keep from separating under high torque loads. Fits 1 or 2 bolt GM and Jeep applications.

Product Features:

Durable polyurethane to handle the stress of high horsepower
Same durometer as other BlackHeart and Hooker poly mounts
Can be used in place of 1-bolt or 2-bolt mount
Absorbs vibration and last longer than rubber
Ideal for use on street or strip applications
Molded indentions for socket clearance to ease installation
Complete with Grade 8 mounting hardware
Bolt Spacing on the Wider Side: 4-inch
Bolt Spacing on the Narrow Side: 1.5-inch

Most Popular 2003 GMC Sierra 1500 Automatic Transmission Pan and Gaskets

Customize your GMC with 15 Automatic Transmission Pan and Gaskets products like Transmission Pan Gaskets, Transmission Oil Pans, and Transmission Oil Pan Gaskets, all priced under $429.99.

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$16.99

Fel-Pro gaskets offer 100% vehicle sealing with application-specific materials to give you sealing solutions with the performance and durability professionals trust.

Product Features:

Meets or exceeds all original equipment specifications
Application specific design to ensure a perfect fit
Unsurpassed quality you can trust
Validated for fit, form and function
Each Fel-Pro gasket, no matter how small, is engineered to exacting standards with proprietary design, engineering and manufacturing processes

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$11.99

Fel-Pro gaskets offer 100% vehicle sealing with application-specific materials to give you sealing solutions with the performance and durability professionals trust.

Product Features:

Meets or exceeds all original equipment specifications
Application specific design to ensure a perfect fit
Unsurpassed quality you can trust
Validated for fit, form and function
Each Fel-Pro gasket, no matter how small, is engineered to exacting standards with proprietary design, engineering and manufacturing processes

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$59.99

On certain GM vehicles, when an original equipment transmission pan is Leaking in need of routine service, loosening and lowering that fluid-filled pan is a messy business. This Dorman OE FIX transmission oil pan is designed to match the performance of the original equipment pan but features a convenient drain plug to allow the transmission fluid to be removed before service. This steel pan is also upgraded with an E-coat finish for excellent resistance to corrosion, and includes a filter assembly, gasket and integrated magnet for a complete repair solution.

Product Features:

Service-friendly – this transmission fluid pan for specified vehicles features an integrated drain plug to allow the trans fluid to be drained before servicing the pan, eliminating messy spills
Durable design – constructed to strict specifications and protected with an E-coat finish, this upgraded pan is engineered to withstand corrosion, impacts and leaks for long and reliable service life
Complete solution – includes pan with integrated magnet, filter assembly and gasket for a hassle-free, professional repair
Trustworthy quality – backed by a team of product experts in the United States and more than a century of automotive experience

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$99.99

This replacement transmission oil pan is a direct replacement for a damaged original equipment transmission pan. Made of quality materials, it’s designed for reliable, leak-free service.

Product Features:

Ideal replacement – this transmission oil pan matches the fit and function of the original pan for a trouble-free replacement
Durable construction – this transmission oil pan is made of quality materials for durability and leak-free performance
Cost-effective solution – offers original equipment performance at competitive price
Quality tested – this part has undergone try-on testing to ensure a quality fit

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$11.79

ATP Transmission Seals And Gaskets are exact fit, no compromise replacement parts

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$34.99

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$14.99

ATP Transmission Seals And Gaskets are exact fit, no compromise replacement parts

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$10.49

Direct replacement – this transmission drain plug matches the dimensions and function of the factory hardware on specified vehicle years, makes and models
Ideal solution – this drain plug is a reliable replacement for an original part that is damaged or lost during service
Durable construction – this part is made from quality materials to ensure reliable performance and a long service life
Quality assured – backed by a team of product experts in the United States and more than a century of automotive experience

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$10.49

Direct replacement – this transmission drain plug matches the dimensions and function of the factory hardware on specified vehicle years, makes and models
Ideal solution – this drain plug is a reliable replacement for an original part that is damaged or lost during service
Durable construction – this part is made from quality materials to ensure reliable performance and a long service life
Quality assured – backed by a team of product experts in the United States and more than a century of automotive experience

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$35.99

Made from cork/neoprene gasket material which features excellent compressibility and high recovery to create a positive seal.

Product Features:

High density cork-nitrile rubber blend
Excellent compressibility and high recovery to create a positive seal
Excellent Compressibility

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$429.99

Internal/External Fins Transfer Heat From Fluid To Ambient Air
Large Neodymium Magnet Drain Plus Captures Loose Particles
1/8 in. NPT Port Comes Ready To Use For Your Temp Sensor
Comes Complete w/All Necessary Hardware To Bolt Directly On

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$409.99

Add fluid capacity to your transmission. Extra fluid means more cooling, and more cooling means better efficiency and performance. Add life to your transmission with a B&M Deep Pan!

Product Features:

Additional Oil Capacity
More Cooling Ability
No Dipstick Modification
Some Include Fluid Pickup Extension
Built-In Drain Plugs
Cast Aluminum

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$405.99

Machined Fins
Neodymium Magnetic Drain Plug
Internal And External fins
Die Cast A356 Aluminum

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$393.99

B&M Cast Aluminum Transmission Pans are constructed of thick A356.0-T6 cast aluminum. Designed to fit a wide range of cars and trucks with TH700-R4, 4L60, 4L60E & 4L65E transmissions, these deep pans significantly increase the fluid capacity and dissipate heat much faster to prolong the life of the transmission and related components. Additional features include an engraved B&M logo, drain port, a magnetic drain plug for catching ferrous metal particles, and complete hardware and installation instructions.

Product Features:

Additional Oil Capacity
More Cooling Ability
No Dipstick Modification
Some Include Fluid Pickup Extension
Built-In Drain Plugs
Cast Aluminum

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$16.99

Product Features:

Choosing Victor Reinz assures getting OE quality parts in gaskets sets that have the coverage, contents, packaging and electronic cataloging to best meet the needs of the aftermarket.

Top Picks for 2003 GMC Sierra 1500 Transmission Seals

Upgrade GMC Sierra 1500s with top-quality Transmission Seals parts, including 22 OEM and aftermarket selections for your 2003 model.

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$18.99

Design type: spring loaded; multi-lip
Temperature range: -20 Deg. F to 300 Deg. F / -29 Deg. C to 49 Deg. C
Resistance to EP lubricants
Low swell in hydrocarbon fluids
Delivers quality and reliable performance for every type of repair

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$12.99

Design type: spring loaded; multi-lip
Temperature range: -20 Deg. F to 300 Deg. F / -29 Deg. C to 49 Deg. C
Resistance to EP lubricants
Low swell in hydrocarbon fluids
Delivers quality and reliable performance for every type of repair

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$6.99

Design type: spring loaded; multi-lip
Temperature range: -20 Deg. F to 300 Deg. F / -29 Deg. C to 49 Deg. C
Resistance to EP lubricants
Low swell in hydrocarbon fluids
Delivers quality and reliable performance for every type of repair

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$12.49

Design type: spring loaded; multi-lip
Temperature range: -20 Deg. F to 300 Deg. F / -29 Deg. C to 49 Deg. C
Resistance to EP lubricants
Low swell in hydrocarbon fluids
Delivers quality and reliable performance for every type of repair

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$21.29

ATP Transmission Seals and Gaskets are exact fit, no compromise replacement parts

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$30.49

National® has built a reputation as one of the most respected names in the industry. We have offered premium sealing solutions for more than 75 years. Our design team keeps pace with the industry and provides advanced solutions for today’s vehicles.

Product Features:

Designed to repair damaged, grooved or worn shafts
Durable stainless steel construction for corrosion-free sealing surface that surpasses most original shaft specifications
Ideal for a shaft where indications of seal wear, such as tracks or grooves have developed
Ultra-thin construction (0.01/0.25mm wall thickness) allows original seal size to be used with minimal additional lip loading
Easy to install with removable flange and installation tool
Installation tool reduces sleeve distortion and allows for installation without removal from the shaft

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$6.99

Design type: springless; single-lip
Temperature range: -40 Deg. F to 225 Deg. F / -40 Deg. C to 107 Deg. C
Good low temperature capability
Low swell in hydrocarbon fluids
Delivers quality and reliable performance for every type of repair

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$30.99

Design type: spring loaded; multi-lip
Temperature range: -40 Deg F to 400 Deg F / -40 Deg C to 204 Deg C
Excellent high temperature capabilities
Compatible with wide range of fluids
Delivers quality and reliable performance for every type of repair

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$8.29

Design type: spring loaded; multi-lip
Temperature range: -20 deg. F to 300 deg. F / -29 deg. C to 49 deg. C
Resistance to EP lubricants
Low swell in hydrocarbon fluids
Delivers quality and reliable performance for every type of repair

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$4.99

from

$32.99

Design type: spring loaded; multi-lip
Temperature range: -40 Deg. F to 225 Deg. F / -40 Deg. C to 107 Deg. C
Good low temperature capability
Low swell in hydrocarbon fluids
Delivers quality and reliable performance for every type of repair

from

$10.29

Design type: spring loaded; multi-lip
Temperature range: -20 Deg. F to 300 Deg. F / -29 Deg. C to 49 Deg. C
Resistance to EP lubricants
Low swell in hydrocarbon fluids
Delivers quality and reliable performance for every type of repair

from

$12.99

ATP Transmission Seals And Gaskets are exact fit, no compromise replacement parts

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$9.99

Product Features:

Brand may vary by location

from

$16.99

from

$17.99

Design type: spring loaded; multi-lip
Temperature range: -20 Deg. F to 300 Deg. F / -29 Deg. C to 49 Deg. C
Resistance to EP lubricants
Low swell in hydrocarbon fluids
Delivers quality and reliable performance for every type of repair

Manual Transmission Bearing and Seal Overhaul Kit

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$188.99

Manual Transmission Bearing and Seal Overhaul Kit

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$24.49

ATP Transmission Seals And Gaskets are exact fit, no compromise replacement parts

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$21.29

Product Features:

Brand may vary by location

from

$14.49

Design type: spring loaded; multi-lip
Temperature range: -20 Deg. F to 300 Deg. F / -29 Deg. C to 49 Deg. C
Resistance to EP lubricants
Low swell in hydrocarbon fluids
Delivers quality and reliable performance for every type of repair

from

$6.99

High-precision and High-quality components used in all KITs
Coverage of classic and new high-tech solutions for the best system coverage

from

$5.99

High-precision and High-quality components used in all KITs
Coverage of classic and new high-tech solutions for the best system coverage

In-Demand Automatic Transmission Parts for 2003 GMC Sierra 1500s

Select from 43 premium Automatic Transmission Parts parts for your 2003 GMC Sierra 1500, with prices ranging from $5.29 to $3,850.99.

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from

$31.05

High-quality products that meet OE appearance and performance to provide professional technicians and DIYers with a cost-effective solution.

Product Features:

Designed to OE standards for ease of installation
100% copper winding for positive valve actuation on command.
Resistance and inductance matched to OE for proper fit, form and function
Precision ground pintle allows pintle to move freely in order to block or vent fluid pressure

from

$16.49

This automatic transmission shifter cable lever is designed to match the fit and function of the original lever on specified vehicles, and is engineered for durability and reliable performance.

Product Features:

Direct replacement – this automatic transmission shifter cable lever is designed to match the fit and function of the original lever
Restores functionality – reliable replacement for an original part that has failed due to corrosion
Durable construction – this part is made from quality materials to ensure reliable performance and long service life
Trustworthy quality – backed by team of product experts in the United States and more than a century of automotive experience

from

$45.99

Direct replacement – this shift interlock solenoid is designed to match the fit and function of the original solenoid on specified vehicles
Ideal solution – this solenoid is a reliable replacement for an original part that is damaged or has failed due to fatigue, excessive heat or electrical current
Durable construction – this solenoid is made from quality components to ensure reliable performance and a long service life
Trustworthy quality – backed by team of product experts in the United States and more than a century of automotive experience

from

$56.99

Shift Solenoid

from

$30.99

Pro-King is the leading supplier of transmission and driveline products in the aftermarket. All products are designed to meet or exceed OE quality, form, fit and function.

Product Features:

Meets or exceeds OE specifications

from

$36.99

Pro-King is the leading supplier of transmission and driveline products in the aftermarket. All products are designed to meet or exceed OE quality, form, fit and function.

Product Features:

Meets or exceeds OE specifications

from

$18.49

Fixing a broken automatic transmission shift cable usually requires replacing the entire cable assembly. This Dorman OE FIX shift cable bushing saves expense by allowing the replacement of just the failed bushing.

Product Features:

Convenient solution – this shift cable bushing directly replaces a broken bushing and eliminates the need to replace the entire cable assembly
Save time and money – save the expense and significant installation time of replacing an entire cable assembly
Ensure fit – this bushing is vehicle-specific and precision-engineered for specified Chevrolet, GMC, Isuzu, and Oldsmobile models and years
Trustworthy quality – designed in the United States and backed by more than a century of automotive aftermarket excellence

from

$5.29

Constructed of quality materials, this multi-purpose retainer provides the same function and versatility as the original equipment retainer ensuring long service life.

Product Features:

Ideal replacement – this retainer matches the fit and function of the original equipment retainer for this vehicle application
Quality material – this retainer is made of durable material for long-lasting service
Versatile design – this retainer is suitable for a variety of automotive uses
Excellent value – this part offers original equipment quality at a competitive cost

from

$70.99

ATP Transmission Components are exact fit, no compromise replacement parts

from

$30.99

An automatic transmission is a hydraulic multi-speed device that does not require any input from the vehicle operator other than selecting vehicle direction. Hydraulic pressure is controlled by a series of electronic shift solenoids that are commanded by the transmission control module. Planetary gear sets and hydraulically controlled shift plates and brake bands apply power to the main shaft in the transmission and out to the vehicles drive wheels.

Product Features:

Product constructed to meet all design and operating characteristics as intended by the vehicle manufacturer.
Precision-wound coated copper windings increase product durability and life cycle.
100% thermo-shock and vibration tested to ensure superior performance in extreme conditions.
100% end-of-line tested to ensure product reliability, every time.

from

$36.49

ATP Transmission Components are exact fit, no compromise replacement parts

from

$65.99

ATP Transmission Components are exact fit, no compromise replacement parts

from

$27.99

Pro-King is the leading supplier of transmission and driveline products in the aftermarket. All products are designed to meet or exceed OE quality, form, fit and function.

Product Features:

Meets or exceeds OE specifications

from

$158.99

Automatic Transmission Elect Harness Vss Repair

from

$216.99

ATHARNESS VSS REPR

from

$94.99

Automatic Transmission Control Solenoid Lock-Up

from

$127.99

Automatic Transmission Elect Harness Vss Repair

from

$51.99

ATP Transmission Components are exact fit, no compromise replacement parts

from

$3850.99

Legendary B&M transmission for street use. B&M’s Street Strip transmission is a complete ready to run unit (less converter) for high performance street and mild strip use. The transmission provides firm shifts and features a standard shift pattern, these

Product Features:

Rebuilt Front Pump
Rebuilt Governor
Comes With Shift Lever
For Late Model Mustang Applications
Hi-Performance Friction Plates

Premium Remanufactured Automatic Transmission

from

$2985.00

All transmissions are completely disassembled and cleaned. All cases are media-blasted. Internal parts are inspected for wear or damage and replaced as required. All bushings are inspected and replaced as necessary. All friction components are replaced with upgraded heavy-duty parts. Drum assemblies are air-checked and side play is measured to ensure proper clearance. All seals, O-rings, and gaskets are replaced. All solenoids are tested and replaced if they do not pass duty-cycle specifications. Internal wiring harnesses are inspected and replaced as necessary. Valve bodies are disassembled, cleaned, and measured for wear. Valves and valve bores are inspected, and bores are machined as required. Completed valve bodies are tested for proper operation prior to dyno testing.

Product Features:

from

$2482.99

from

$2399.99

from

$2256.00

Moveras Remanufactured Transmissions manufactures automatic transmissions for virtually every vehicle on the road; We are committed to remanufacturing transmissions to the same standards and methodologies used for OEM transmissions; Each Moveras transmission is produced in a World Class manufacturing facility; Our entire process has been developed from scratch, utilizing LEAN manufacturing principles; Our transmissions are produced in a Clean Room environment; Every transmission is built to the same exacting standards by using a precisely documented and controlled process.

Product Features:

OEM-Level Quality: Each transmission is remanufactured to meet or exceed original manufacturer specifications for seamless compatibility and superior performance
Advanced Remanufacturing Process: Each transmission is completely disassembled, and critical components are replaced or upgraded to ensure long-lasting performance
High-Quality Torque Converter: A fully remanufactured torque converter is included, tested for leaks, lock-up functionality, and balance to enhance durability and smooth operation
Precision Engineering: Each valve body is remanufactured to OEM specifications, ensuring proper hydraulic flow and consistent shift performance
Dyno Testing: All Moveras transmissions are dyno-tested under real-world driving conditions to ensure reliable, consistent performance before leaving the factory
Nationwide Limited Warranty: Every transmission comes with a comprehensive Limited Warranty, giving you confidence and peace of mind, no matter where you are on the road

from

$2243.00

Our remanufactured transmissions have improved torque converters included with every transmission to eliminate the possibility of front seal leaks, vibration or premature bushing wear, All torque converters are tested for leaks, lock-up, concentricity & balance. Every fully remanufactured valve body, with complete system correction & recalibration kit, is tested independently & includes updated throttle valve, manual valve, 4-spool switch valve, pressure regulator valve & governor plugs for improved shifting, lubrication & performance. All wear-prone valves are restored to stringent specifications & vacuum tested to confirm proper function. Each remanufactured transmission is hot, cold, load & simulated road testing. All remanufactured transmissions are backed by the industry’s best, no-hassle nationwide warranty(limited).

Product Features:

Our Remanufactured Transmissions include torque convertors, trans is completely disassembled & checked then reassembled to spec for tolerances, vacuum, seal & balance, all wear parts replaced & sim tested.
Our Remanufactured Transmissions include torque convertors, trans is completely disassembled & checked then reassembled to spec for tolerances, vacuum, seal & balance, all wear parts replaced & sim tested.
Transmissions are securely packaged in a recyclable container that will also protect your core on the return trip. Our nationwide warehouse network means speedy delivery.
All of our transmissions are Dyno tested to ensure the highest standard of trouble free service and longevity.

Most Sold 2003 GMC Sierra 1500 Transmission Cooler and Parts

Explore our best-selling GMC parts for the 2003 Sierra 1500 among 19 OEM and aftermarket options starting from $11.99.

show more show less

from

$85.99

Our products are engineered and tested to provide years of trouble free operation. Backed by over 50 years of mobile a/c experience, fix it once and fix it right with Imperial.

Product Features:

Imperial high-performance transmission cooler
Size: 3/4″ x 10″ x 15-7/8″
SAE 45-degree fittings for maximum reliability
Electrostatic powder-coated to prevent corrosion
SAE 45 degree fittings for maximum reliability
Electrostatically powder coated to prevent corrosion
All aluminum lightweight construction
SAE 45 degree fittings for maximum reliability
Electrostatically powder coated to prevent corrosion
All aluminum lightweight construction

from

$70.99

The Imperial Maxi-Cool XL’s plate and fin design offer excellent cooling efficiency in a compact, space-efficient design.

Product Features:

Imperial Maxi-Cool plate and fin transmission cooler
Size: 3/4″ x 11″ x 7-1/2″
Mid-size and full-size cars, pickups
GVWR up to 20,000 lbs.; towing up to 2,500 lbs.
Compatible with OEM cooler systems
Made with the highest quality materials
100% pressure testing to 150 PSI for quality assurance
33% more efficient than a comparable tube and fin design

from

$60.99

The Imperial Maxi-Cool XL’s plate and fin design offer excellent cooling efficiency in a compact, space-efficient design.

Product Features:

Imperial Rapid-Cool plate and fin transmission cooler
Size: 3/4″ x 11″ x 6″
Sub-compact to compact cars
GVWR up to 18,000 lbs.
Compatible with OEM cooler systems
Compatible with OEM cooler systems
Ultrasonically soldered for reliability
100% pressure testing to 150 PSI for quality assurance
High efficiency turbulators

from

$11.99

Our products are engineered and tested to provide years of trouble free operation. Backed by over 50 years of mobile a/c experience, fix it once and fix it right with Imperial.

Product Features:

Imperial mounting kit system
For installation of transmission coolers and electric fans
Provides quick, effective installation of Imperial products
Contains nylon mounting rods, foam pads and locking buttons
Aftermarket electric fan and cooler mounting rods
Made with the highest quality materials
Quality machined for durability
Removable buttons for relocation
Aftermarket electric fan and cooler mounting rods
Made with the highest quality materials
Quality machined for durability
Removable buttons for relocation

from

$55.99

Our products are engineered and tested to provide years of trouble free operation. Backed by over 50 years of mobile a/c experience, fix it once and fix it right with Imperial.

Product Features:

Imperial Econo-Kool tube and fin transmission cooler
Size: 3/4″ x 5″ x 15-7/8″
Compact and mid-size cars
GVWR up to 16,000 lbs.; towing up to 2,500 lbs.
Compatible with OEM cooler systems
Ultrasonically soldered for reliability
100% pressure testing to 150 PSI for quality assurance
High efficiency turbulators
Compatible with OEM cooler systems
Ultrasonically soldered for reliability
100% pressure testing to 150 PSI for quality assurance
High efficiency turbulators

from

$40.99

Our products are engineered and tested to provide years of trouble free operation. Backed by over 50 years of mobile a/c experience, fix it once and fix it right with Imperial.

Product Features:

Imperial Econo-Kool tube and fin transmission cooler
Size: 3/4″ x 5″ x 12-1/2″
Sub-compact to compact cars
GVWR up to 12,000 lbs.
Compatible with OEM cooler systems
Ultrasonically soldered for reliability
100% pressure testing to 150 PSI for quality assurance
High efficiency turbulators
Compatible with OEM cooler systems
Ultrasonically soldered for reliability
100% pressure testing to 150 PSI for quality assurance
High efficiency turbulators

from

$35.99

This automatic transmission oil cooler hose assembly is designed to match the fit and function of an original assembly. It is engineered from durable components as a reliable replacement for leaking or damaged lines on specified vehicles.

Product Features:

Direct replacement – this automatic transmission oil cooler hose assembly is designed to match the fit and function of the original equipment assembly on specified vehicle makes, models and years
Ideal solution – engineered to help ensure proper transmission cooling when the original assembly is leaking or has failed from corrosion, collision, vibration, or fitting damage
Durable construction – made of quality materials for reliable performance and Length service life
Trustworthy quality – backed by a team of product experts in the United States and more than a century of automotive experience

from

$40.99

Direct replacement – this automatic transmission oil cooler hose assembly is designed to match the fit and function of the original equipment assembly on specified vehicle makes, models and years
Ideal solution – engineered to help ensure proper transmission cooling when the original assembly is leaking or has failed from corrosion, collision, vibration, or fitting damage
Durable construction – made of quality materials for reliable performance and Length service life
Trustworthy quality – backed by a team of product experts in the United States and more than a century of automotive experience

from

$85.99

The Imperial Maxi-Cool XL’s plate and fin design offer excellent cooling efficiency in a compact, space-efficient design.

Product Features:

Class “A” motor homes, large travel trailers, 5th-wheel trailers
GVWR up to 30,000 lbs.; towing up to 10,000 lbs.
Compatible with OEM cooler systems
33% more efficient than a comparable tube and fin design

from

$163.99

This automatic transmission oil cooler is designed to match the performance of an original equipment cooler on specified vehicle makes, models and years. When a factory automatic transmission oil cooler fails from contamination, heat or impact, this replacement cooler is engineered to help maintain proper transmission fluid temperature and protect the transmission from damage.

Product Features:

Direct replacement – this automatic transmission oil cooler is designed to match the performance of an original equipment cooler on specified vehicle makes, models and years
Ideal solution – when a factory automatic transmission oil cooler fails from contamination, heat or impact, this replacement cooler is engineered to help maintain proper transmission fluid temperature
Durable construction – designed and manufactured to strict specifications for reliable performance
Trustworthy quality – backed by a team of product experts in the United States and more than a century of automotive experience

from

$65.99

Our products are engineered and tested to provide years of trouble free operation. Backed by over 50 years of mobile a/c experience, fix it once and fix it right with Imperial.

Product Features:

Imperial Econo-Kool tube and fin transmission cooler
Size: 3/4″ x 10″ x 15-7/8″
Class “A” motor homes, large travel trailers, 5th-wheel trailers
GVWR up to 26,000 lbs.; towing up to 10,000 lbs.
Compatible with OEM cooler systems
Ultrasonically soldered for reliability
100% pressure testing to 150 PSI for quality assurance
High efficiency turbulators
Compatible with OEM cooler systems
Ultrasonically soldered for reliability
100% pressure testing to 150 PSI for quality assurance
High efficiency turbulators

from

$80.99

The Imperial Maxi-Cool XL’s plate and fin design offer excellent cooling efficiency in a compact, space-efficient design.

Product Features:

Imperial Rapid-Cool plate and fin transmission cooler
Size: 3/4″ x 11″ x 9-1/2″
Pickup trucks and vans, class “C” motor homes, travel trailers to 24′
GVWR up to 24,000 lbs.; towing up to 5,000 lbs.
33% more efficient than a comparable tube and fin design
Compatible with OEM cooler systems
Made with the highest quality materials
100% pressure testing to 150 PSI for quality assurance
33% more efficient than a comparable tube and fin design

from

$52.99

Our products are engineered and tested to provide years of trouble free operation. Backed by over 50 years of mobile a/c experience, fix it once and fix it right with Imperial.

Product Features:

Mid-size and full-size cars, pickups
GVWR up to 18,000 lbs.; towing up to 3,500 lbs
Compatible with OEM cooler systems
Ultrasonically soldered for reliability
100% pressure testing to 150 PSI for quality assurance
High efficiency turbulators
Compatible with OEM cooler systems
Ultrasonically soldered for reliability
100% pressure testing to 150 PSI for quality assurance
High efficiency turbulators

from

$79.99

Our products are engineered and tested to provide years of trouble free operation. Backed by over 50 years of mobile a/c experience, fix it once and fix it right with Imperial.

Product Features:

Imperial high-performance transmission cooler
Size: 3/4″ x 7-1/2″ x 15-7/8″
SAE 45-degree fittings for maximum reliability
Electrostatic powder-coated to prevent corrosion
Up to Class C motorhomes, towing up to 5,000 pounds
SAE 45 degree fittings for maximum reliability
Electrostatically powder coated to prevent corrosion
All aluminum lightweight construction

from

$35.99

Direct replacement – this automatic transmission oil cooler hose assembly is designed to match the fit and function of the original equipment assembly on specified vehicle makes, models and years
Ideal solution – engineered to help ensure proper transmission cooling when the original assembly is leaking or has failed from corrosion, collision, vibration, or fitting damage
Durable construction – made of quality materials for reliable performance and long service life
Trustworthy quality – backed by a team of product experts in the United States and more than a century of automotive experience

from

$34.99

Direct replacement – this automatic transmission oil cooler hose assembly is designed to match the fit and function of the original equipment assembly on specified vehicle makes, models and years
Ideal solution – engineered to help ensure proper transmission cooling when the original assembly is leaking or has failed from corrosion, collision, vibration, or fitting damage
Durable construction – made of quality materials for reliable performance and Length service life
Trustworthy quality – backed by a team of product experts in the United States and more than a century of automotive experience

from

$68.99

Our products are engineered and tested to provide years of trouble free operation. Backed by over 50 years of mobile a/c experience, fix it once and fix it right with Imperial.

Product Features:

Imperial high-performance transmission cooler
Size: 3/4″ x 7-1/2″ x 12-1/2″
SAE 45-degree fittings for maximum reliability
Electrostatic powder-coated to prevent corrosion
SAE 45 degree fittings for maximum reliability
Electrostatically powder coated to prevent corrosion
All aluminum lightweight construction
SAE 45 degree fittings for maximum reliability
Electrostatically powder coated to prevent corrosion
All aluminum lightweight construction

from

$65.99

Our products are engineered and tested to provide years of trouble free operation. Backed by over 50 years of mobile a/c experience, fix it once and fix it right with Imperial.

Product Features:

Imperial Econo-Kool tube and fin transmission cooler
Size: 3/4″ x 7-1/2″ x 15-7/8″
Pickup trucks and vans, class “C” motor homes, travel trailers to 24′
GVWR up to 22,000 lbs.; towing up to 5,000 lbs.
Compatible with OEM cooler systems
Ultrasonically soldered for reliability
100% pressure testing to 150 PSI for quality assurance
High efficiency turbulators
Compatible with OEM cooler systems
Ultrasonically soldered for reliability
100% pressure testing to 150 PSI for quality assurance
High efficiency turbulators

from

$151.99

Our products are engineered and tested to provide years of trouble free operation. Backed by over 50 years of mobile a/c experience, fix it once and fix it right with Imperial.

Product Features:

Imperial Econo-Kool tube and fin transmission cooler
Size: 1-1/2″ x 12″ x 15 1/8″
Severe-duty transmission oil cooling applications
Towing with class “A” motor home or towing more than 10,000 lbs.
Compatible with OEM cooler systems
Ultrasonically soldered for reliability
100% pressure testing to 150 PSI for quality assurance
High efficiency turbulators

Top-Rated Transmission Parts Brands For Your 2003 GMC Sierra 1500

Shop for the best-rated brands offering Transmission Parts and other products for your 2003 GMC Sierra 1500s. Below you’ll find some of our best rated Transmission Parts from National, Imperial, and Pro-King, and more. Transmission Parts from these brands that fit a 2003 Sierra 1500 start at just $6.99 and are rated as high as 4.3 stars. OEM and aftermarket Transmission Parts don’t get more top quality, durable, and affordable than from the brands below.

Popular National 2003 GMC Sierra 1500 Transmission Parts

When it comes to maintaining or upgrading your 2003 GMC Sierra 1500, using quality Transmission Parts is essential to ensure durability and a perfect fit. National ticks all of those boxes. We offer a wide selection of National Transmission Parts, specifically designed for the 2003 GMC Sierra 1500. With over 3 National brand Transmission Parts in stock, you’re sure to find what you need. The prices for these top-notch parts start as low as $6.99, with an average price of just $12.99. Plus, with over 22 customer reviews and an average rating of 4.3 stars, you can trust that our National Transmission Parts will get the job done right. Choose Advance Auto Parts for reliability, quality, and expert-approved parts that keep your vehicle running strong.

from $18.99

(4)

Multi-Purpose Seal

“great item”

from $6.99

(5)

Multi-Purpose Seal

“This part was exactly the same as the part on my 2004 Trailblazer 4.2L, even had the same number stamped on it.”

from $12.99

(13)

Multi-Purpose Seal

“Fixed my leak”

Popular Imperial 2003 GMC Sierra 1500 Transmission Parts

Imperial auto parts is one of the highest quality Transmission Part brands in the market. Any 2003 GMC Sierra 1500 owner should feel confident when installing genuine Imperial parts in their vehicle. To ensure the best fit and performance for your 2003 Sierra 1500, Advance Auto Parts carries a full inventory of 3 Imperial Transmission Parts. Plus you will be keeping your GMC in peak condition while saving money because prices on these Imperial Transmission Parts range from $27.49 to $85.99, plus, with more than 13 customer reviews and an impressive 4.1 stars average rating, you can be confident the Fram Transmission Parts below will deliver on both quality and value.

from $85.99

(4)

High Performance Transmission Oil Cooler

“good quality,easy to install.”

from $70.99

(7)

Maxi-Kool XL Transmission Oil Cooler

“this transmission oil cooler is replacing my one on my 2000 dodge dakota its priced right mid size and easy to put in the ome one is 250 this is 60 an”

from $27.49

(2)

Transmission Fitting Kit

“Radiator quick connect for transcooler”

FAQs for 2003 GMC Sierra 1500 Transmission Parts

Which Transmission Parts are best-sellers for 2003 GMC Sierra 1500s?

Out of 206 Transmission Parts that fit 2003 GMC Sierra 1500s, the following parts are the top sellers:

Mounting Kit System (6014844) – $11.99
High Performance Transmission Oil Cooler (3670013) – $79.99
Multi-Purpose Temperature Sensor (15730286) – $34.99

What’s the price range for 2003 GMC Sierra 1500 Transmission Parts?

Transmission Part prices for the 2003 GMC Sierra 1500 start at $3.99 and go up to $4,715.99 for the most premium parts.

What’s the average price of a Transmission Part for a 2003 GMC Sierra 1500?

The average price for Transmission Parts for the 2003 GMC Sierra 1500 is $319.36. Keep in mind the variety of part types within our Transmission Part category so you are likely to find a wide range of prices across a variety of parts and components.

Does Advance Auto Parts sell Transmission Parts for other GMC Sierra 1500 model years?

Yes, we currently carry Transmission Parts for 26 model years of GMC Sierra 1500s between 1999 and 2026. Transmission Parts are bought most frequently for the following model years: 2022, 2021, 2020, 2019, 2018, 2017, 2016, 2015, and 2014.

What are the cheapest Transmission Parts for my 2003 GMC Sierra 1500?

The cheapest 2003 GMC Sierra 1500 Transmission Parts we carry in stock are:

Transfer Case Shift Fork Insert (12008219) – $3.99
Differential Pinion Seal (10751052) – $4.99
Splash Shield Retainer (11910824) – $5.29
Shaft Seal (50206180) – $5.99
Multi-Purpose Seal (18444499) – $6.99

What are the top-rated Transmission Parts that fit the 2003 GMC Sierra 1500?

Out of 15,862 reviews by customers, our 2003 GMC Sierra 1500 Transmission Parts have an average customer rating of . These are some of the highest-rated Transmission Part types for the 2003 GMC Sierra 1500 and their top-rated products:

Automatic Transmission Pan and Gaskets
- Transmission Oil Pan Gasket 17 Bolt Hole One Piece Gasket (5992044) – $16.99
- Transmission Oil Pan: Direct Fit, Steel, 12 Quart (15680134) – $59.99
- Transmission Oil Pan Gasket 16 Bolt Hole One Piece Gasket (5781647) – $11.99
Transmission Bearings
- Transmission Oil Pan Gasket 17 Bolt Hole One Piece Gasket (5992044) – $16.99
- Transmission Oil Pan: Direct Fit, Steel, 12 Quart (15680134) – $59.99
- Transmission Oil Pan Gasket 16 Bolt Hole One Piece Gasket (5781647) – $11.99
Back Up Neutral Safety Parts
- Transmission Oil Pan Gasket 17 Bolt Hole One Piece Gasket (5992044) – $16.99
- Transmission Oil Pan: Direct Fit, Steel, 12 Quart (15680134) – $59.99
- Transmission Oil Pan Gasket 16 Bolt Hole One Piece Gasket (5781647) – $11.99

What types of Transmission Parts do you sell for my 2003 GMC Sierra 1500?

As of 6/2/26, these are some of the most in-demand types of Transmission Parts for a 2003 GMC Sierra 1500:

Can I get help with 2003 GMC Sierra 1500 Transmission Part orders?

Contact our customer support team, by chat or phone, through the help desk page, where you can find instant answers about GMC Transmission Parts and more.

What is your return policy for GMC Sierra 1500 Transmission Parts?

Advance Auto Parts keeps returns simple. For new GMC Sierra 1500 Transmission Parts and accessories, your online orders can be returned, in their original condition, within 45 days. For requirements, see the returns page.

2003 GMC Sierra 1500 Transmission Parts

ATP – AT PRESS SW MANIFOLD (Part No.JE-10)

Dorman – Transmission Shift Interlock Solenoid (Part No.924-977)

Pro-King – Automatic Transmission Remanufactured Torque Converter (Part No.GM35CW)

ATP – Reusable Oe Style Automatic Transmission Oil Pan Gasket (Part No.JG-142)

Driveworks – Auto Transmission Output Shaft Seal (Part No.S-4934)

B & M – Shifter Accessories, Bracket and Lever Kit Fits TH400/TH350/TH250/200-4R/700R4 (Part No.35498)

Motive Gear – Differential Pinion Seal (Part No.8610)

ATP – Shift Solenoid (Part No.CE-14)

Delphi – Vehicle Speed Sensor (Part No.SS10309)

ATP – Automatic Transmission Extension Housing Seal (Part No.JO-124)

Dorman – Help – Shift Lever Boot (Part No.47106CD)

Felpro – Transmission Oil Pan Gasket 16 Bolt Hole One Piece Gasket (Part No.TOS 18663)

Schaeffler – Shaft Seal (Part No.SS2960)

Carquest Premium – Multi-Use Connector (Part No.PTA1398)

Carquest Premium – Multi-Use Connector (Part No.PTA1184)

GM Genuine Parts – Parking / Neutral Position and Back Up Light Switch (Part No.D2257C)

Dorman – Transmission Drain Plug – M12-1.75 Pilot Point (Part No.090-208CD)

ARP Auto Racing – For Use With General Motors, 0.590"L Under Head, 10Mm X 1.5 Thread, With Washers (Part No.230-7305)

aFe POWER – Transmission Pan (Part No.46-70242)

ATP – Automatic Transmission Master Repair Kit Plus (Part No.JMS-25)

ATP – Automatic Transmission Extension Housing Seal (Part No.HO-9)

Imperial – Maxi-Kool XL Transmission Oil Cooler (Part No.243007)

National – Shaft Repair Sleeve (Part No.99174)

Carquest Premium – Automatic Transmission Fluid Temperature Sensor (Part No.WTA1322)

ARP Auto Racing – For Use With 90 Degree V6 Chevy/ 265 And 454 V8 With 2 Piece Rear Seal (Part No.200-2902)

National – Multi-Purpose Bearing (Part No.A-35)

ATP – Automatic Transmission Oil Pump Gasket (Part No.SG-40)

Anchor – Transmission Mount Rear (Part No.2811)

Anchor – Transmission Mount: Rear, 1 Piece (Part No.2638)

Hooker BlackHeart – Hooker BlackHeart Polyurethane Transmission Mount – Red (Part No.71223030HKR)

Hooker BlackHeart – Hooker BlackHeart Polyurethane Transmission Mount – Black (Part No.71223029HKR)

Felpro – Transmission Oil Pan Gasket 17 Bolt Hole One Piece Gasket (Part No.TOS 18698)

Felpro – Transmission Oil Pan Gasket 16 Bolt Hole One Piece Gasket (Part No.TOS 18663)

Dorman – Transmission Oil Pan: Direct Fit, Steel, 12 Quart (Part No.265-811)

Dorman – Transmission Oil Pan: Direct Fit, Steel, 13.5 Quart (Part No.265-810)

ATP – Automatic Transmission Oil Pump Gasket (Part No.SG-40)

ATP – Reusable Oe Style Automatic Transmission Oil Pan Gasket (Part No.JG-142)

ATP – Automatic Transmission Oil Pan Gasket (Part No.SG-30)

Dorman – Transmission Drain Plug – M12-1.75 Pilot Point (Part No.090-208CD)

Dorman – Drain Plug – M12-1.75 Pilot Point (Part No.65416)

Mr. Gasket – Automatic Transmission Oil Pan Gasket (Part No.8695)

aFe POWER – Transmission Pan (Part No.46-70242)

B & M – CAST DEEP PAN (Part No.70295)

aFe POWER – Transmission Pan (Part No.46-70240)

B & M – Transmission Pan, Cast Deep Pan 4L60 and 4L60E (Part No.70260)

Victor Reinz – Transmission Oil Pan Gasket (Part No.71-14944-00)

National – Multi-Purpose Seal (Part No.4934)

National – Multi-Purpose Seal (Part No.4583)

National – Multi-Purpose Seal (Part No.4950)

National – Multi-Purpose Seal (Part No.4528N)

ATP – Automatic Transmission Oil Pump Seal (Part No.CO-37)

National – Shaft Repair Sleeve (Part No.99138)

National – Multi Purpose Seal (Part No.8792S)

National – Multi Purpose Seal (Part No.100712V)

National – Multi-Purpose Seal (Part No.714598)

Motive Gear – Differential Pinion Seal (Part No.8610)

National – Multi-Purpose Seal (Part No.710507)

National – Multi-Purpose Seal (Part No.710597)

ATP – Automatic Transmission Extension Housing Seal (Part No.HO-9)

Driveworks – Auto Transmission Output Shaft Seal (Part No.S-4934)

Motive Gear – Differential Pinion Seal (Part No.26064028)

National – Manual Transmission Output Shaft Seal (Part No.4532N)

USA Standard Gear – Manual Transmission Bearing and Seal Overhaul Kit (Part No.78916)

ATP – Automatic Transmission Extension Housing Seal (Part No.JO-124)

Driveworks – Oil Seal (Part No.S-5208)

National – Multi-Purpose Seal (Part No.714654)

Schaeffler – Shaft Seal (Part No.SS2960)

Schaeffler – Shaft Seal (Part No.SS2114)

Carquest – Automatic Transmission Control Solenoid (Part No.S9871)

Dorman – Help – Shift Lever Arm (Part No.74124)

Dorman – Transmission Shift Interlock Solenoid (Part No.924-976)

ATP – Shift Solenoid (Part No.CE-14)

Pro-King – Automatic Transmission Solenoid (Part No.52-0214)

Pro-King – Automatic Transmission Solenoid (Part No.52-0203)

Dorman – Help – Shifter Cable Bushing Kit (OE Fix) (Part No.14073)

Dorman – Splash Shield Retainer (Part No.963-405D)

ATP – Automatic Transmission Control Solenoid (Part No.JE-8)

Carquest Premium – Automatic Transmission Control Solenoid (Part No.SBA4928)

ATP – Automatic Transmission Band (2Nd & 4Th) (Part No.CX-42)