1978 GMC G25 Transmission Parts

Essential 1978 GMC G25 Transmission Parts

ATP – AT CONTR SOLENOID (Part No.SE-1)

AT CONTR SOLENOID

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$111.99
AT CONTR SOLENOID

Pro-King – Automatic Transmission Basic Rebuild Kit (Part No.KB-828)

Automatic Transmission Basic Rebuild Kit

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$84.99
This Basic Rebuild Kit contains a complete gasket Kit and friction set. Each Rebuild Kit contains only the highest quality parts that meet or exceed OE specifications.

Product Features:
  • Does not include steels or filter
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Dorman – Help – Auto Transmission Case Vent (Part No.14689)

Auto Transmission Case Vent

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$6.99
This transfer case vent is designed to match the fit and function of the original vent on specified vehicles, and is engineered for durability and reliable performance.

Product Features:
  • Direct replacement – this transfer case vent is designed to match the fit and function of the original vent on specified vehicles
  • Restores functionality – reliable replacement for an original vent that has failed due to blockage or fatigue
  • 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
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ATP – AT CLUTCH PLATE (Part No.JC-50)

AT CLUTCH PLATE

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$8.99
AT CLUTCH PLATE

ATP – AT OVERHAUL KIT (Part No.CGS-17)

AT OVERHAUL KIT

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$97.99
AT OVERHAUL KIT

Felpro – Manual Transmission Gasket Set (Part No.TS 80108)

Manual Transmission Gasket Set

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$9.29
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
  • Engineered and manufactured specifically for the repair environment
  • Unsurpassed quality you can trust
  • Includes all parts needed to complete the repair
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Mr. Gasket – Automatic Transmission Dipstick With Tube (Part No.9764)

Automatic Transmission Dipstick With Tube

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$30.99
Compliment your engine compartment with one of these beautifully chrome plated dipsticks and tubes. Includes O-ring.

Product Features:
  • Fits GM TH350 Chevy specific modify for others
  • 27 in. length
  • Chrome plated steel
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ARP Auto Racing – For Use With 90 Degree V6 Chevy/ 305, 502 V8 With 1 Piece Rear Seal (Part No.200-2906)

For Use With 90 Degree V6 Chevy/ 305, 502 V8 With 1 Piece Rear Seal

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$18.99
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 & 305-502 With 1-pc Rear Seal
  • 0.725″ Underhead Length
  • 200,000 PSI
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B & M – Transmission Cast Deep Pan, Brushed Finish TH-350 (Part No.30280)

Transmission Cast Deep Pan, Brushed Finish TH-350

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$256.99
These B&M automatic transmission deep pans provide additional fluid capacity and cooling ability. No modifications to the dipstick are needed. They include a drain plug for clean and easy fluid changes. Adds 3 quarts to the Transmission.

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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ATP – AT OIL PAN GASKET (Part No.CG-10)

AT OIL PAN GASKET

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$15.99
AT OIL PAN GASKET

Edelbrock – Automatic Trans Cable Adapter #8026 for GM 2004R, 700R4, 4L60 Transmissions (Part No.8026)

Automatic Trans Cable Adapter #8026 for GM 2004R, 700R4, 4L60 Transmissions

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$18.99
Product Features:
  • Edelbrock Part # 8026 GM Transmission adapter is for use with 2004R, 700R4, 4L60 transmissions.
  • This kit relocates the pin position on an Edelbrock Carburetor when hooking up to a throttle valve style transmission (700R4, 2004R, 4L60).
  • The pin location is critical as the TV controls line pressure, shift points, shift firmness, and part throttle downshifts.
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National – Multi Purpose Seal (Part No.8792S)

Multi Purpose Seal

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$6.99
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:
  • Low swell in hydrocarbon fluids
  • Design type: spring loaded; multi-lip
  • Provides good low temperature capability
  • Temperature range: -40°F to 225°F; -40°C to 107°C
  • Delivers quality and reliable performance for every type of repair
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Driveworks – Oil Seal (Part No.S-2043)

Oil Seal

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$7.79
Value-priced seal meets all cataloged application requirements.

Product Features:
  • Brand may vary by location
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Permatex – Ultra Grey RTV Silicone Gasket Maker, 3 OZ (Part No.82194)

Ultra Grey RTV Silicone Gasket Maker, 3 OZ

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$11.49
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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ATP – AT DETENT CABLE SEAL (Part No.SO-36)

AT DETENT CABLE SEAL

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$3.99
AT DETENT CABLE SEAL

National – Multi Purpose Seal (Part No.5200)

Multi Purpose Seal

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$12.99
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:
  • Low swell in hydrocarbon fluids
  • Design type: spring loaded; multi-lip
  • Provides good low temperature capability
  • Temperature range: -40°F to 225°F; -40°C to 107°C
  • Delivers quality and reliable performance for every type of repair
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Carquest Premium – Neutral Safety Switch (Part No.SBA4487)

Neutral Safety Switch

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$15.79
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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ATP – ATP Automatic Transmission Detent Cable (Part No.Y-100)

ATP Automatic Transmission Detent Cable

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$22.99
Detent cables connect the throttle mechanism to the transmission. Old cables can bind, break, or just become sluggish. The best repair is to replace the old cable with a new one. ATP Detent cables are designed to fit And function just like the original part to ensure durability And long life.

Product Features:
  • Includes brackets, grommets, etc to match original
  • Helps transmission determine ideal downshift
  • Improves vehicle performance
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ATP – AT DPSTK TUBE SEAL (Part No.SO-35)

AT DPSTK TUBE SEAL

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$5.99
AT DPSTK TUBE SEAL

Felpro – Manual Transmission Gasket Set (Part No.TS 30118)

Manual Transmission Gasket Set

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$24.49
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
  • Engineered and manufactured specifically for the repair environment
  • Unsurpassed quality you can trust
  • Includes all parts needed to complete the repair
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ATP – AUTO TRANS BAND (Part No.JX-58)

AUTO TRANS BAND

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$27.99
AUTO TRANS BAND

ATP – AT SOLENOID SEAL (Part No.JO-15)

AT SOLENOID SEAL

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$3.99
AT SOLENOID SEAL

National – Shaft Repair Sleeve (Part No.99176)

Shaft Repair Sleeve

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$46.49
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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National – Taper Bearing Cone (Part No.LM501349)

Taper Bearing Cone

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$17.99
Manufactured with premium-grade steel, National® taper bearing cones feature crowned raceways and rollers to ensure even load distribution.

Product Features:
  • 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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B & M – Automatic Shifter, Pro Ratchet 3 and 4 Speed (Part No.80842)

Automatic Shifter, Pro Ratchet 3 and 4 Speed

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$409.99
The Pro Ratchet shifter is one of our most popular and easiest to operate race shifters. Features include positive ratcheting design that self-centers the handle after each shift giving you maximum clearance behind the shifter and will not allow you to mi

Product Features:
  • Single Hand Operated Reverse Lockout
  • Reverse Lockout Meets NHRA And IHRA Requirements
  • Quick And Easy To Operate
  • Stick Always Returns To Center Position
  • Easiest Unit To Double Shift w/Air/CO2/Electric Mech
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Anchor – Transmission Mount: Rear, 1 Piece (Part No.2378)

Transmission Mount: Rear, 1 Piece

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$9.49
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 BUIC 65-74; CHEV 57-84; GMC 67-84; OLDS 64-79; PONT 64-81;. 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: 1957-1984
  • Weight approx: 2 Lbs
  • HEIGHT: 1.8 INCH: 45.7 MM
  • ALL BOLT HOLES INLINE
  • BOLT CENTERLINE: 1.5 INCH: 38.1 MM
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ATP – AT OIL PUMP GASKET (Part No.SG-27)

AT OIL PUMP GASKET

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$10.99
AT OIL PUMP GASKET

Popular 1978 GMC G25 Transmission Parts Categories

1978 GMC G25 Transmission Parts

You count on your 1978 GMC G25 to run right. That means taking care of it with regular maintenance, necessary repairs, and the right parts. Advance Auto Parts can help with all of that thanks to our extensive inventory of trusted Transmission Parts. With 129 Transmission Parts ranging in price from $1.99 to $973.99, you’re sure to find everything you need for your 1978 GMC G25.

Brands matter. If you want to shop a specific Transmission Parts brand, we stock 18 different brands like Imperial, National, and Permatex. 1978 GMC G25 Transmission Parts start as low as $1.99!

One of the best ways to find top quality OEM or aftermarket Transmission Parts is by asking professionals. Short of that, you can shop with confidence thanks to our 2,726 extensive product reviews on 1978 GMC G25 Transmission Parts. Some of the top-rated Transmission Parts products we carry are Multi Purpose Seal with 4.4 stars and Wheel Bearing: Direct Fit, 1 Piece with 2.8 stars.

Did we mention you can order your Transmission Parts from our online catalog and have them shipped right to your garage? Or, if you feel like seeing the parts first-hand, search for your nearest Advance Auto Parts location above and pick up in-store when you’re ready. Browse our full Transmission Parts inventory for your 1978 GMC G25 below to get started!

Top-Rated Transmission Parts Brands For Your 1978 GMC G25

Trusted Transmission Parts OEM and aftermarket product brands are what Advance Auto Parts specializes in. The brands we work with are sure to keep that 1978 GMC G25 running right for years to come. In our inventory you’ll find brands like Imperial, National, Permatex, and even more.

Popular Carquest Transmission Parts

You’ll find popular Carquest brand products across Automatic Transmission Parts. All are waiting to get your 1978 GMC G25 back on the road. Some of the top-rated Carquest products in these categories are:
Automatic Transmission Vacuum Modulator
from $51.05
(1)
Automatic Transmission Vacuum Modulator
Transmission Modulator Valves

FAQs for 1978 GMC G25 Transmission Parts

What are the most purchased Transmission Parts for the 1978 GMC G25?

Out of 129 Transmission Parts for the 1978 GMC G25, the most popular in our inventory are:
Ultra Grey RTV Silicone Gasket Maker, 3 OZ
from $11.49
(95)
Ultra Grey RTV Silicone Gasket Maker, 3 OZ
Transmission Pan Gaskets
Bearings
from $14.99
(21)
Bearings
Manual Transmission Output Shaft Bearings
Cylindrical Bearing
from $22.99
(20)
Cylindrical Bearing
Axle Output Shaft Bearings

What are the top-rated 1978 GMC G25 Transmission Parts?

Top-rated Transmission Parts for your 1978 GMC G25 based on customer reviews/ratings are:
Multi Purpose Seal
from $6.99
(20)
Multi Purpose Seal
“Would have been fine most likely – if correct seal was in the box. For redoing a Front Crank Seal on a 4 cylinder 89 Ranger.”
Wheel Bearing: Direct Fit, 1 Piece
from $14.99
(19)
Wheel Bearing: Direct Fit, 1 Piece
“ok”
Econo-Kool® Transmission Oil Cooler
from $65.99
(11)
Econo-Kool® Transmission Oil Cooler
“In the instructions, a fitting kit #252 was required for my particular truck. It was wrong…#395 was the correct kit. Folks at Imperial advised me of”