2020 GMC Sierra 3500 HD Transmission Parts

Below you will find various in-demand GMC Transmission Parts, components and accessories for your 2020 Sierra 3500 HD. Advance Auto Parts has popular Sierra 3500 HD parts like Automatic Transmission Pan and Gaskets, Automatic Transmission Parts, Transmission Seals and more. You’ll also find aftermarket and OEM Transmission Parts for other Sierra 3500 HD model years including 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2021, 2022 and more. Select a category of 2020 GMC Sierra 3500 HD Transmission Parts below and start saving instantly.

Popular 2020 GMC Sierra 3500 HD Transmission Parts Categories

Automatic Transmission Shift Linkage Bushings

Transmission Pan Gaskets

Transmission Mounts

Back Up and Neutral Safety Switches

Transmission Oil Pan Gaskets

Automatic Transmission Output Shaft Seals

Automatic Transmission Dipstick Seals

Back Up Light Relays

Extension Housing Seals

Automatic Transmission Oil Cooler Gaskets

Remanufactured Automatic Transmissions

Automatic Transmission Valve Body Separator Plates

Essential Transmission Parts for 2020 GMC Sierra 3500 HDs

from

$2.62

Oil Dipstick Seal

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$21.99

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

Product Features:

Convenient solution – this shift cable bushing kit 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 kit is vehicle-specific and precision-engineered for specified General Motors and Chrysler models and years
Trustworthy quality – designed in the United States and backed by more than a century of automotive aftermarket excellence

from

$16.99

Permatex’s The Right Stuff 90 Minute Series offers the fastest return to service in a in just 90 minute! This leak-proof, elastomeric “Formed-in-place” material is more reliable and longer lasting than pre-cut gaskets. It is blowout resistant and protects against leaks and seepage caused by vibration and thermal expansion. The Right Stuff 90 Minute Grey is specified for high torque and high vibration applications and is formulated to meet or exceed performance standards for long-term sealability, durability and handling.

Product Features:

Designed to perform under higher torque loads associated with engines having closely spaced bolt patterns
Sensor-safe, non-corrosive, RTV silicone
Protects against leaks caused by vibration and thermal expansion
Meets performance specs of OE silicone gaskets
Quickly returns vehicle to service in just 90 minutes

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$47.15

AT Pan Gasket

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$20.29

Transfer case seals missing or deteriorated? This transfer case output shaft seal kit allows you to restore a proper seal between the transfer case and motor to eliminate drivability issues from liquid or debris entering the transfer case.

Product Features:

Direct replacement – this transfer case seal kit allows you to directly replace the original seal on certain vehicle applications.
Effective fix – restores proper seal between transfer case and motor to keep out contaminants.
Durable construction – built for reliable longevity, free of defects in materials and craftmanship
Trustworthy quality – backed by team of designers and engineers in the United States

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$14.79

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:

Design type: spring loaded; multi-lip
Temperature range: -20°F to 300°F / -29°C to 49°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

Permatex Ultra Grey is specified for high torque and high vibration applications. Ultra Grey offers a sensor-safe, low odor, non-corrosive formula and is OEM specified to fit dealership warranty requirements. This high performance gasket maker meets performance specs of OE silicone gaskets and can be used on high torque and vibration applications such as valve covers, water pump, intake manifold end seals ad thermostat housings.

Product Features:

High torque and rigidity
Sensor-safe, non-corrosive formula
OEM specified
Low-odor, non-corrosive formula
Ideal for closed spaced bolt patterns

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$28.49

Specifically designed to perform under higher torque loads associated with engines having closely spaced bolt patterns (typically import vehicles). This product is blowout resistant, allowing leakproof gaskets to be made and put into service in just one minute. Sensor-safe, The Right Stuff GREY seals instantly, forming a reliable, long lasting elastomeric rubber gasket that outperforms pre-molded gaskets. Specified by major import OEMs, this material is resistant to powertrain fluids (oil, coolant and ATF) and operates in environments to 450°F (232°C) continuous; 500°F (260°C) intermittent.

Product Features:

Ideal for rigid cast aluminum parts
Meets OEM Specifications
Sensor safe & non-corrosive
Performs under higher torque loads associated with engines having closely spaced bolt patterns (typical of import vehicles)
Blowout resistant, allowing leakproof gaskets to be made in just one minute
Seals instantly, forming a reliable, long lasting elastomeric rubber gasket
Superior resistance to powertrain fluids including engine oil, transmission fluid, gear lube and coolants
Temperature range -60°C to 260°C (-75°F to 500°F) intermittent
Applications: Automotive, industrial and marine gaskets, valve covers, gearbox covers, pumps, compressors, oil pans, thermostat housings, water pumps, etc.

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$18.47

AT Rear Seal

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$77.52

AT Neutral Safety Sw

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$63.99

CARQUEST premium engine management products provide the right products for a wide range of domestic and import applications. Delivering the highest performance and durability under demanding conditions.

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$16.49

ACDelco GM Original Equipment Wiring Relays are designed, engineered, and tested to rigorous standards, and are backed by General Motors. ACDelco GM Original Equipment parts are the true OE parts installed during the production of or validated by General Motors for GM vehicles. Some ACDelco GM Original Equipment parts may have formerly appeared as GM Genuine Parts (OE) or ACDelco Professional.

Product Features:

Some ACDelco GM Original Equipment parts may have formerly appeared as GM Genuine Parts (OE) or ACDelco Professional
ACDelco GM Original Equipment 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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$2612.99

Moveras Remanufactured Transmissions manufactures automatic transmissions for virtually every vehicle on the road.

Product Features:

Product might not be available in all states due to local laws.
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.

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$2901.99

At Shift Pro Inc, fully remanufactured transmissions go beyond the name. So, what’s in that name to start? Pro Engineering: your transmission has been re-engineered to meet or exceed OE standards for tolerances, durability, and quality. Pro Performance: upgraded components and a fully remanufactured torque converter add to enhanced durability over your transmission’s lifetime. Pro Performance: hot-, cold-, load-, and simulated road-tested on custom dynamometers, your transmission is ready to go, wherever you’re headed.

Product Features:

Fully tested torque converter included. Shift Pro Inc tests for leaks, lock-up, concentricity, and balance to eliminate the possibilities of front seal leaks, premature bushing wear, and vibration.
All dynamometer testing is conducted with Shift Pro Inc’s custom testing program for at least 30 minutes.
During dynamometer testing, Shift Pro Inc transmissions are cold, hot, load, and road tested using a fully synthetic transmission fluid and filtration system.
All wear-prone valves in the completely remanufactured valve body are restored to stringent specifications and vacuum tested to verify proper function.
Shift Pro Inc’s quality control process includes build specification checks performed by four different specialized technicians during the remanufacturing process.
No paperwork or registration is required with Shift Pro Inc’s warranty. Each no-hassle warranty is attached to the vehicle VIN and transferrable with ownership.
Product might not be available in all states due to local laws.

from

$2882.99

(PDT)Premium Drivetrain Transmissions are remanufactured to original equipment (OEM) demanding specifications by an OEM builder. Each transmission assembly is manufactured with the highest technology equipment, the most intelligent engineering support, and the best practices available in remanufacturing today.

Product Features:

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 required.
100% of friction components are replaced with upgraded heavy duty parts.
Drum assemblies are air checked and side play is checked to assure proper clearance. 100% of seals, o’rings and gaskets are replaced.
100% of solenoids are checked and replaced if they do not pass duty cycle tests. Internal wiring harness are checked and replaced as necessary. Valve bodies are disassembled, cleaned, and measured for wear. Valve body valves and valve bores are inspected and valve bores are machined as required. Completed valve bodies are tested for proper operation prior to dyno testing.
Transmissions are assembled, end plays are set and fasteners are torqued to the required specification.
Torque Converter: 100% of converters are dynamic balanced. 100% of pumps are furnaced brazed. 100% new bearings and o’rings. 100% new springs and rollers in stator. 100% new thrust washers. 100% new friction liners in overdrive lockup converters.
100% of transmissions are dynamometer tested to ensure proper pressures and shift quality throughout the operating range. All upshifts and downshifts are checked against preset parameters. Torque converter stall speed and lockup is verified on the dyno
Product might not be available in all states due to local laws.

from

$2882.99

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 required.
100% of friction components are replaced with upgraded heavy duty parts.
Drum assemblies are air checked and side play is checked to assure proper clearance. 100% of seals, o’rings and gaskets are replaced.
100% of solenoids are checked and replaced if they do not pass duty cycle tests. Internal wiring harness are checked and replaced as necessary. Valve bodies are disassembled, cleaned, and measured for wear. Valve body valves and valve bores are inspected and valve bores are machined as required. Completed valve bodies are tested for proper operation prior to dyno testing.
Transmissions are assembled, end plays are set and fasteners are torqued to the required specification.
Torque Converter: 100% of converters are dynamic balanced. 100% of pumps are furnaced brazed. 100% new bearings and o’rings. 100% new springs and rollers in stator. 100% new thrust washers. 100% new friction liners in overdrive lockup converters.
100% of transmissions are dynamometer tested to ensure proper pressures and shift quality throughout the operating range. All upshifts and downshifts are checked against preset parameters. Torque converter stall speed and lockup is verified on the dyno
Product might not be available in all states due to local laws.

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$87.99

A true performance application component for cars, trucks, hot rods, racing/competition, yet popularly used for street vehicles when more horsepower is added. Soft running enough to absorb vibrations for street use yet rugged for racing use. Helps control torque on high performance vehicles. Maintains proper drive shaft angle to help prevent early wear and unexpected power train damage. Replaces the original, short lived and typically too-soft rubber mounts and outdates those hard-running metal transmission mounts. Resistant to under vehicle fluid oils, coolants and road contaminants. Made of Energy’s Hyper-Flex performance polyurethane and heavy duty hardware – for added durability.

Product Features:

Unique Safety Interlock Design
Impervious to Vehicle Oils and Chemicals
Strong Enough Too Handle High Performance

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$17.29

The purpose of the mount is to support the engine and transmission on the chassis and dampen vibration and noise from reverberating to the rest of the vehicle. Engine and Transmission Mounts are engineered and manufactured to meet or exceed OEM specifications using the latest CAD/CAM engineering process to ensure superior quality, form, fit and function. Only premium quality materials are used in the manufacturing process to guarantee precise performance and maximum durability. Applicable to CADI 00-20; CHEV 91-21; GMC 91-21;. Please verify your application.

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 #5 bolts.
SUPERIOR BOND: A special Chemlock® 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: 1991-2021
Weight approx: 2 Lbs
MATERIAL: RUBBER, STEEL
HEIGHT: 2.06 INCH / 52.32 MM
STUD: M10x1.5 1.15 INCH / 29.21 MM

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$23.49

The purpose of the mount is to support the engine and transmission on the chassis and dampen vibration and noise from reverberating to the rest of the vehicle. Engine and Transmission Mounts are engineered and manufactured to meet or exceed OEM specifications using the latest CAD/CAM engineering process to ensure superior quality, form, fit and function. Only premium quality materials are used in the manufacturing process to guarantee precise performance and maximum durability. Applicable to CADI 99-14; CHEV 82-19; GMC 82-14; HUMMER 03-10; ISUZU 06-08; OLDS 91-94;. Please verify your application.

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 #5 bolts.
SUPERIOR BOND: A special Chemlock® 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

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$52.99

The purpose of the mount is to support the engine and transmission on the chassis and dampen vibration and noise from reverberating to the rest of the vehicle. Engine and Transmission Mounts are engineered and manufactured to meet or exceed OEM specifications using the latest CAD/CAM engineering process to ensure superior quality, form, fit and function. Only premium quality materials are used in the manufacturing process to guarantee precise performance and maximum durability. Applicable to CADI 21-22; CHEV 11-22; GMC 11-22;. Please verify your application.

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 #5 bolts.
SUPERIOR BOND: A special Chemlock® 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: 2011-2022
Weight approx: 2 Lbs

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$33.03

AT Valve Body Separa

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$11.49

This Dorman Automatic Transmission Oil Cooler Gasket eliminates leaks where the oil cooler line connects to the transmission. Gasket may break down over time, causing leaks, and should be replaced any time the oil cooler line and transmission are separated.

Product Features:

Durable construction – rubber over steel construction creates a positive seal and retains its shape.
Direct replacement – fits and functions like original equipment
Easy to install – direct-fit, no special tools required
Vehicle tested – has undergone on-vehicle testing to ensure proper fit and performance

Upgrade your 2020 GMC Sierra 3500 HD with Top-Quality Transmission Parts

When it comes to maintaining or upgrading your 2020 GMC Sierra 3500 HD, 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 3500 HD functioning at its best. At Advance Auto Parts, we offer a wide selection of 19 Transmission Parts for the 2020 GMC Sierra 3500 HD, designed to meet your needs without breaking the bank. From Automatic Transmission Pan and Gasket replacements to Automatic Transmission Parts 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 2020 GMC Sierra 3500 HD at great prices. Our Transmission Parts inventory for this model ranges from just $2.62 to $2,974.99, with an average price of $128.39. Our 19 Transmission Parts in stock come from 7 trusted brands, so you’re sure to find the right part for your 2020 GMC Sierra 3500 HD 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 2020 GMC Sierra 3500 HD, we stock popular OEM and aftermarket Transmission Parts from top names like Permatex ACDelco, and more. Permatex Transmission Parts start at just $6.99 and boast an impressive 5 stars average rating from customers. With 864 customer reviews and counting, our 2020 GMC Sierra 3500 HD 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 2020 GMC Sierra 3500 HD is always ready to roll. We’re committed to providing you with everything you need to keep your Sierra 3500 HD in top shape, all in one place. Start shopping confidently below for your 2020 GMC Sierra 3500 HD!

Best-Selling Automatic Transmission Pan and Gaskets for 2020 GMC Sierra 3500 HDs

Enhance the driving experience in your GMC with 8 quality Automatic Transmission Pan and Gasket components, starting at $6.99.

show more show less

from

$11.49

High torque and rigidity
Sensor-safe, non-corrosive formula
OEM specified
Low-odor, non-corrosive formula
Ideal for closed spaced bolt patterns

from

$6.99

High torque and rigidity
Sensor-safe, non-corrosive formula
OEM specified
Low-odor, non-corrosive formula
Ideal for closed spaced bolt patterns

from

$19.99

Permatex’s The Right Stuff 1 Minute Series offers the fastest return to service in just 1 minute! This leak-proof, elastomeric “Formed-in-place” material is more reliable and longer lasting than pre-cut gaskets. It is blowout resistant and protects against leaks and seepage caused by vibration and thermal expansion. The Right Stuff 1 Minute Grey is specified for high torque and high vibration applications and is formulated to meet or exceed performance standards for long-term sealability, durability and handling.

Product Features:

Designed to perform under higher torque loads associated with engines having closely spaced bolt patterns
Sensor-safe, non-corrosive, RTV silicone
Protects against leaks caused by vibration and thermal expansion
Meets performance specs of OE silicone gaskets
Quickly returns vehicle to service in just 1 minute

from

$16.99

Designed to perform under higher torque loads associated with engines having closely spaced bolt patterns
Sensor-safe, non-corrosive, RTV silicone
Protects against leaks caused by vibration and thermal expansion
Meets performance specs of OE silicone gaskets
Quickly returns vehicle to service in just 90 minutes

from

$11.49

Durable construction – rubber over steel construction creates a positive seal and retains its shape.
Direct replacement – fits and functions like original equipment
Easy to install – direct-fit, no special tools required
Vehicle tested – has undergone on-vehicle testing to ensure proper fit and performance

from

$28.49

Ideal for rigid cast aluminum parts
Meets OEM Specifications
Sensor safe & non-corrosive
Performs under higher torque loads associated with engines having closely spaced bolt patterns (typical of import vehicles)
Blowout resistant, allowing leakproof gaskets to be made in just one minute
Seals instantly, forming a reliable, long lasting elastomeric rubber gasket
Superior resistance to powertrain fluids including engine oil, transmission fluid, gear lube and coolants
Temperature range -60°C to 260°C (-75°F to 500°F) intermittent
Applications: Automotive, industrial and marine gaskets, valve covers, gearbox covers, pumps, compressors, oil pans, thermostat housings, water pumps, etc.

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$47.15

AT Pan Gasket

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$32.99

OEM specified. Designed specially for high-torque and high vibration applications, like those common in import engines, this premium RTV gasket maker exceeds manufacturers’ performance requirements. Sensor-safe, low odor, and non-corrosive. Maximum vibration resistance, with outstanding resistance to oils, cooling and shop fluids. Temperature range -65ºF to 500ºF (-54 Deg. C to 260 Deg. C) intermittent.

Product Features:

Designed specially for high-torque and high vibration applications
Maximum vibration resistance with outstanding resistance to oils, cooling and shop fluids
OEM specified
Low-odor, non-corrosive formula
Temperature Range: -65 Deg. F to 500 Deg. F (-54 Deg. C to 260 Deg. C)

Most Popular 2020 GMC Sierra 3500 HD Automatic Transmission Parts

Customize your GMC with 3 Automatic Transmission Parts products like Automatic Transmission Shift Linkage Bushings, Remanufactured Automatic Transmissions, and Automatic Transmission Valve Body Separator Plates, all priced under $2,974.99.

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from

$21.99

Convenient solution – this shift cable bushing kit 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 kit is vehicle-specific and precision-engineered for specified General Motors and Chrysler models and years
Trustworthy quality – designed in the United States and backed by more than a century of automotive aftermarket excellence

from

$2974.99

Fully tested torque converter included. Shift Pro Inc tests for leaks, lock-up, concentricity, and balance to eliminate the possibilities of front seal leaks, premature bushing wear, and vibration.
All dynamometer testing is conducted with Shift Pro Inc’s custom testing program for at least 30 minutes.
During dynamometer testing, Shift Pro Inc transmissions are cold, hot, load, and road tested using a fully synthetic transmission fluid and filtration system.
All wear-prone valves in the completely remanufactured valve body are restored to stringent specifications and vacuum tested to verify proper function.
Shift Pro Inc’s quality control process includes build specification checks performed by four different specialized technicians during the remanufacturing process.
No paperwork or registration is required with Shift Pro Inc’s warranty. Each no-hassle warranty is attached to the vehicle VIN and transferrable with ownership.
Product might not be available in all states due to local laws.

from

$33.03

AT Valve Body Separa

Top Picks for 2020 GMC Sierra 3500 HD Transmission Seals

Upgrade GMC Sierra 3500 HDs with top-quality Transmission Seals parts, including 4 OEM and aftermarket selections for your 2020 model.

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from

$18.47

AT Rear Seal

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$58.80

AT Rear Seal

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$35.49

AT Rear Seal

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$2.62

Oil Dipstick Seal

In-Demand Transmission Mounts for 2020 GMC Sierra 3500 HDs

Select from 1 premium Transmission Mounts parts for your 2020 GMC Sierra 3500 HD.

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from

$52.99

The purpose of the mount is to support the engine and transmission on the chassis and dampen vibration and noise from reverberating to the rest of the vehicle. Engine and Transmission Mounts are engineered and manufactured to meet or exceed OEM specifications using the latest CAD/CAM engineering process to ensure superior quality, form, fit and function. Only premium quality materials are used in the manufacturing process to guarantee precise performance and maximum durability. Applicable to CADI 21-22; CHEV 11-22; GMC 11-22;. Please verify your application.

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 #5 bolts.
SUPERIOR BOND: A special Chemlock® 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: 2011-2022
Weight approx: 2 Lbs

Most Sold 2020 GMC Sierra 3500 HD Torque Converter and Related Products

Explore our best-selling GMC parts for the 2020 Sierra 3500 HD among 1 OEM and aftermarket options starting from $26.02.

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from

$26.02

AT Torque Conv. Hous

Top-Rated Transmission Parts Brands For Your 2020 GMC Sierra 3500 HD

Shop for the best-rated brands offering Transmission Parts and other products for your 2020 GMC Sierra 3500 HDs. Below you’ll find some of our best rated Transmission Parts from Permatex and ACDelco, and more. Transmission Parts from these brands that fit a 2020 Sierra 3500 HD start at just $6.99 and are rated as high as 5 stars. OEM and aftermarket Transmission Parts don’t get more top quality, durable, and affordable than from the brands below.

Popular Permatex 2020 GMC Sierra 3500 HD Transmission Parts

When it comes to maintaining or upgrading your 2020 GMC Sierra 3500 HD, using quality Transmission Parts is essential to ensure durability and a perfect fit. Permatex ticks all of those boxes. We offer a wide selection of Permatex Transmission Parts, specifically designed for the 2020 GMC Sierra 3500 HD. With over 6 Permatex 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 $19.49. Plus, with over 106 customer reviews and an average rating of 5 stars, you can trust that our Permatex 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.

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$28.49

This product is not rated

The Right Stuff Grey Instant Gasket Maker, 147ml Cartridge

“”

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$32.99

This product is not rated

Ultra Grey RTV Gasket Maker (9.5 oz.)

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$16.99

This product is not rated

The Right Stuff: Grey, 90 Minute Gasket Maker, 3 OZ

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Popular ACDelco 2020 GMC Sierra 3500 HD Transmission Parts

ACDelco auto parts is one of the highest quality Transmission Part brands in the market. Any 2020 GMC Sierra 3500 HD owner should feel confident when installing genuine ACDelco parts in their vehicle. To ensure the best fit and performance for your 2020 Sierra 3500 HD, Advance Auto Parts carries a full inventory of 7 ACDelco Transmission Parts. Plus you will be keeping your GMC in peak condition while saving money because prices on these ACDelco Transmission Parts range from $16.49 to $77.52, plus, with more than 2 customer reviews and an impressive 5 stars average rating, you can be confident the Fram Transmission Parts below will deliver on both quality and value.

from
$58.8

This product is not rated

AT Rear Seal

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$77.52

This product is not rated

AT Neutral Safety Sw

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from
$47.15

This product is not rated

AT Pan Gasket

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FAQs for 2020 GMC Sierra 3500 HD Transmission Parts

Which Transmission Parts are best-sellers for 2020 GMC Sierra 3500 HDs?

Out of 19 Transmission Parts that fit 2020 GMC Sierra 3500 HDs, the following parts are the top sellers:

The Right Stuff: Grey, 90 Minute Gasket Maker, 3 OZ (12079746) – $16.99
Shift Cable Bushing Kit (12455503) – $21.99
Transmission Oil Cooler Seal (12007498) – $11.49

What’s the price range for 2020 GMC Sierra 3500 HD Transmission Parts?

Transmission Part prices for the 2020 GMC Sierra 3500 HD start at $2.62 and go up to $2,974.99 for the most premium parts.

What’s the average price of a Transmission Part for a 2020 GMC Sierra 3500 HD?

The average price for Transmission Parts for the 2020 GMC Sierra 3500 HD is $128.39. 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 3500 HD model years?

Yes, we currently carry Transmission Parts for 18 model years of GMC Sierra 3500 HDs between 2007 and 2025. Transmission Parts are bought most frequently for the following model years: 2022, 2021, 2019, 2018, 2017, 2016, 2015, 2014, and 2013.

What are the cheapest Transmission Parts for my 2020 GMC Sierra 3500 HD?

The cheapest 2020 GMC Sierra 3500 HD Transmission Parts we carry in stock are:

Oil Dipstick Seal (11844774) – $2.62
Sensor-Safe, High Torque RTV Silicone Gasket Maker (99997948) – $6.99
Sensor-Safe, High-Torque RTV Silicone Gasket Maker (7160017) – $11.49
Transmission Oil Cooler Seal (12007498) – $11.49
Black Multi-Purpose Relay (15730131) – $16.49

What are the top-rated Transmission Parts that fit the 2020 GMC Sierra 3500 HD?

Out of 864 reviews by customers, our 2020 GMC Sierra 3500 HD Transmission Parts have an average customer rating of . These are some of the highest-rated Transmission Part types for the 2020 GMC Sierra 3500 HD and their top-rated products:

Automatic Transmission Pan and Gaskets
- Sensor-Safe, High Torque RTV Silicone Gasket Maker (99997948) – $6.99
- Sensor-Safe, High-Torque RTV Silicone Gasket Maker (7160017) – $11.49
- The Right Stuff: 1 Minute Gasket Maker: Grey, 3 OZ (11082073) – $19.99

What types of Transmission Parts do you sell for my 2020 GMC Sierra 3500 HD?

As of 2/5/25, these are some of the most in-demand types of Transmission Parts for a 2020 GMC Sierra 3500 HD:

Can I get help with 2020 GMC Sierra 3500 HD 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 3500 HD Transmission Parts?

Advance Auto Parts keeps returns simple. For new GMC Sierra 3500 HD Transmission Parts and accessories, your online orders can be returned, in their original condition, within 45 days. For requirements, see the returns page.

2020 GMC Sierra 3500 HD Transmission Parts

Mahle – Oil Dipstick Seal (Part No.A1120666332MAH)

Dorman – Help – Shift Cable Bushing Kit (Part No.14104)

Permatex – The Right Stuff: Grey, 90 Minute Gasket Maker, 3 OZ (Part No.34328)

ACDelco – AT Pan Gasket (Part No.J5040366488ACD)

Dorman – Transfer Case Seal Kit (Part No.600-218)

National – Multi Purpose Seal (Part No.4934)

Permatex – Sensor-Safe, High Torque RTV Silicone Gasket Maker (Part No.22074)

Permatex – The Right Stuff Grey Instant Gasket Maker, 147ml Cartridge (Part No.34311)

SKF – AT Rear Seal (Part No.J5071366796SKF)

ACDelco – AT Neutral Safety Sw (Part No.J4050485851ACD)

Carquest Premium – Neutral Safety Switch (Part No.CSC1705)

ACDelco – Black Multi-Purpose Relay (Part No.D1780C)

Moveras – 6L90 – Automatic Transmission (Part No.M01990)

Shift Pro by ETE – 6L90 Automatic Transmission Assembly (Part No.T282120)

Premium Drive Train – Automatic Transmission Assembly (Part No.T6L90E1890T2)

Premium Drive Train – Automatic Transmission Assembly (Part No.T6L80E8304T4)

Energy Suspension – Transmission Mount (Part No.3.1129G)

Anchor – Transmission Mount: Rear, 1 Piece (Part No.2811)

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

Anchor – Transmission Mount: Rear, 1 Piece (Part No.3278)

ACDelco – AT Valve Body Separa (Part No.J5028745013ACD)

Dorman – Help – Transmission Oil Cooler Seal (Part No.66219)

Permatex – Sensor-Safe, High-Torque RTV Silicone Gasket Maker (Part No.82194)

Permatex – Sensor-Safe, High Torque RTV Silicone Gasket Maker (Part No.22074)

Permatex – The Right Stuff: 1 Minute Gasket Maker: Grey, 3 OZ (Part No.25238)

Permatex – The Right Stuff: Grey, 90 Minute Gasket Maker, 3 OZ (Part No.34328)

Dorman – Help – Transmission Oil Cooler Seal (Part No.66219)

Permatex – The Right Stuff Grey Instant Gasket Maker, 147ml Cartridge (Part No.34311)

ACDelco – AT Pan Gasket (Part No.J5040366488ACD)

Permatex – Ultra Grey RTV Gasket Maker (9.5 oz.) (Part No.85084)

Dorman – Help – Shift Cable Bushing Kit (Part No.14104)

Shift Pro by ETE – 6L90 Automatic Transmission Assembly (Part No.T282139)

ACDelco – AT Valve Body Separa (Part No.J5028745013ACD)

SKF – AT Rear Seal (Part No.J5071366796SKF)

ACDelco – AT Rear Seal (Part No.J5071366801ACD)

ACDelco – AT Rear Seal (Part No.J5071366796ACD)

Mahle – Oil Dipstick Seal (Part No.A1120666332MAH)

Anchor – Transmission Mount: Rear, 1 Piece (Part No.3278)

ACDelco – AT Torque Conv. Hous (Part No.J5090577062ACD)