1978 GMC C25 Transmission Parts

Name: Energy Suspension Transmission Mount, 3.1158G
Brand: Energy Suspension
SKU: 3.1158G
Price: 55.99 USD

Below you will find various in-demand GMC Transmission Parts, components and accessories for your 1978 C25. Advance Auto Parts has popular C25 parts like Transmission Mounts, Transmission Bearings, Transmission Seals and more. You’ll also find aftermarket and OEM Transmission Parts for other C25 model years including 1975, 1976, 1977 and more. Select a category of 1978 GMC C25 Transmission Parts below and start saving instantly.

Please Select your Vehicle to See Exact Fit Parts

Popular 1978 GMC C25 Transmission Parts Categories

Gear Shift Levers

Transmission Torque Converters

OE Transmission Coolers

Transfer Shaft Bearing

Manual Transmission Differential Bearings

Transmission Solenoids

Transmission Shift Cables

Countershaft Bearings

Back Up Lamp Switches

Transmission Pan Gaskets

Transmission Oil Cooler Fittings

Shifter Cables and Brackets

Pinion Bearings

Transmission Mounts

Transmission Oil Pans

Transmission Master Repair Kits

Back Up and Neutral Safety Switches

Transmission Rebuild Kits

Transmission Oil Pan Gaskets

Transmission Dipsticks

Automatic Transmission Differential Bearings

Transmission Bushings

Detent Cables

Automatic Transmission Output Shaft Seals

Automatic Transmission Oil Pump Seals

Transmission Modulator Valves

Pinion Seals

Manual Transmission Intermediate Shaft Bearings

Transmission Seals and O-rings

Automatic Transmission Kickdown Cable Brackets

Automatic Transmission Extension Housing Seal Kits

Torque Converter Seals

Extension Housing Seals

Manual Transmission Output Shaft Seals

Manual Transmission Gasket Sets

Gear Shift Lever Bushing

Manual Transmission Top Gaskets

Miscellaneous Automatic Transmission Seals

Transmission Crossmembers

Transmission Shift Kits

Transmission Bands

Automatic Transmission Selector Shaft Seals

Manual Transmission Seals

Automatic Transmission Speedometer Pinion Seals

Remanufactured Automatic Transmissions

Trans Mount Bushing

Transmission Cooler

Automatic Transmission Friction Discs

Automatic Transmission Clutch Plates

Transmission Gaskets

Manual Transmission Bearing

Ring Gear Bolt Lock Plate

Transmission Lock-up Switch

Overdrive Seals

Universal Transmission Gasket

GM Torque Converters

Automatic Transmission Kickdown Cables

Manual Transmission Output Shaft Seal Kits

Automatic Transmission Kickdown

Automatic Transmission Output Speed Sensor Seal

Essential Transmission Parts for 1978 GMC C25s

Energy Suspension Transmission Mount, 3.1158G

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$55.99

Energy Suspension continues to be the World leader in performance polyurethane suspension technology. Dedication to manufacturing and developing superior products has established Energy Suspension as the most asked-for name in performance polyurethane components today. The complex and diverse nature of Energy’s proprietary Hyper-Flex material requires constant attention to developing the optimum polyurethane formulas. This devotion has produced the quality components that our customers continue to demand. Providing problem-solving solutions with applications for the most popular vehicles, paired with our Limited warranty and superb customer support, Energy Suspension is your first quality choice in performance polyurethane suspension components.

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$118.99

ATP AT CONTR SOLENOID, SE-1. DRIVELINE – TRANSMISSION PARTS>TRANSMISSION PARTS>SOLENOIDS>SOLENOIDS from ATP

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$47.49

ACDelco Professional Neutral Safety Switch is a high quality aftermarket replacement component for one or more of the following vehicle systems: automatic transmission/transaxle, and/or manual drivetrain and axles. This premium aftermarket switch is manufactured to meet or exceed your expectations for fit, form, and function.

B & M Automatic Shifter, Pro Ratchet 3 And 4 Speed, 80843

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$460.99

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 miss a shift by over-shifting a gear. The reverse lockout feature only requires one hand to operate and meets both NHRA and IHRA safety regulations. Other features include a neutral safety switch, backup light switch, along with a simulated carbon fiber wrapped aluminum cover. The cover is treated to a high-quality hydro-dip process and material to add a high-tech and realistic carbon look to your vehicle’s interior, but at a substantial cost savings versus authentic carbon fiber. Also includes a classic white shift knob with the B&M logo, a 5-foot long Super Duty shift cable, gear indicator, cable brackets, levers and all necessary hardware with detailed instructions for an easy at home installation. This shifter comes with all necessary parts for use with three and four-speed automatic transmissions such as 1966 and later Chrysler Torqueflite A727, A904, A500, and A518 transmissions. Ford C4, C6 transmissions. GM models TH200, TH250, TH350, TH400, 2004R, 700R4, 4L60, 4L60E – 4L85E without PRNDL switch transmissions. Notes: For Ford AOD transmissions you will need installation kit #40496, AODE and 4R70W require installation kit #40504, E40D and 4R100 require installation kit #40505 and GM 4L60E – 4L85E transmissions with PRNDL switch require cable bracket #70499. Overall dimensions – 10.75L x 2.9W x 9.25H

ATP Automatic Transmission Clutch Plate, JC-57

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$13.79

ATP Transmission Components are exact fit, no compromise replacement parts

ATP Automatic Transmission Universal Detent Cable 28 To 48 Inches, Y-754

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$54.99

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. Pioneer detent cables are designed to fit and function just like the original part to ensure durability and long life.

ATP Automatic Transmission Extension Housing Seal, SO-22

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$9.59

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

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$7.79

Value-priced seal meets all cataloged application requirements.

Felpro Transmission Oil Pan Gasket 13 Bolt Hole One Piece Gasket, TOS 18633

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$9.99

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

Victor Reinz Transmission Oil Pan Gasket, 71-14938-00

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$14.99

With Victor Reinz gaskets, you can be sure you are getting sealing solutions that deliver OE quality gasket technology and engineering. That is because Victor Reinz is an original equipment supplier and the trusted choice of manufacturers the world over, offering broad coverage for foreign and domestic cars and trucks. In Victor Reinz gasket sets, you get the right combination of components needed for fast, long-lasting repairs.

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$4.99

Value-priced seal meets all cataloged application requirements.

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$7.99

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.

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$21.29

ATP Automatic Transmission Oil Pump Gasket, SG-27

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$11.79

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

B & M Converter Lockup Control For Gm Automatic Trans With Lockup Converter, 70248

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$389.99

The B&M Lockup Controller provides control of lockup through vehicle speed on GM TH-700, 200, 200-4R, 350 and 4L60 with a lockup converter, Can be used for lockup operation when converting a non-lockup equipped vehicle to a lock-up style.

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$35.59

B&M Shift Cable Bracket for GM TH200, TH200-4R, TH250, TH350, TH400, TH700-R4, 4L60, 4L60E, 4L65E, 4L80E and 4L85E Automatic Transmissions without PRNDL switch.

Pro-King Differential Ring Gear Bolt, 744A935

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$1.89

Pro-King is the leading supplier of transmission and driveline products in the aftermarket.

Imperial Econo-Kool Transmission Oil Cooler, 242012

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$54.99

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.

Felpro Manual Transmission Gasket Set, TS 80161

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$29.99

Fel-Pro® gaskets are specifically designed for the repair environment to deliver a reliable seal on even the most troublesome applications. Designed for imperfect sealing surfaces and manufactured with proprietary materials, you can count on Fel-Pro for innovative sealing solutions for the real-world repair environment.

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$6.49

Value-priced seal meets all cataloged application requirements.

Hooker BlackHeart Transmission Cross member, BHS549

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$311.99

The Hooker BlackHeart BHS549 is a heavy-duty transmission cross member engineered for GM LS and Gen V LT engine swaps into classic GM trucks and SUVs (1973-1987 C10/C20, 1973-1982 Blazer/Jimmy). It’s specifically designed to support 4L80E and 4L85E transmissions, offering bolt-in installation, optimal driveline angles, and maximum exhaust clearance.

Pro-King Automatic Transmission Deluxe Rebuild Kit, KS-15

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$268.99

One of the most complete Rebuild Kits in the automatic transmission industry today. Each Rebuild Kit contains only the highest quality parts that meet or exceed OE specifications.

ATP Automatic Transmission Speedometer Pinion Seal, SO-13

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$3.19

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

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$21.99

With advanced load-carrying capacity and compact design, tapered roller bearings are used in wheel bearings, transmissions, differentials, transfer cases and other miscellanous applications. FAG manufacturers over 100 million tapered roller bearings annually.

Carquest Automatic Transmission Modulator Valve, VMC1051

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$66.99

The transmission modulator valve is a vacuum operated mechanical device located on the transmission case. This valve will have a actuator rod extended into the transmission valve body inside the transmission which will control the flow of transmission fluid within the transmission to place the transmission in the most optimal forward gear selection.

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$15.29

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

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$50.99

Felpro Manual Transmission Gasket Set, TS 30118

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$24.99

Upgrade your 1978 GMC C25 with Top-Quality Transmission Parts

When it comes to maintaining or upgrading your 1978 GMC C25, 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 C25 functioning at its best. At Advance Auto Parts, we offer a wide selection of 154 Transmission Parts for the 1978 GMC C25, designed to meet your needs without breaking the bank. From Transmission Mount replacements to Transmission Bearings 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 1978 GMC C25 at great prices. Our Transmission Parts inventory for this model ranges from just $1.89 to $1,400.00, with an average price of $193.49. Our 154 Transmission Parts in stock come from 20 trusted brands, so you’re sure to find the right part for your 1978 GMC C25 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 1978 GMC C25, we stock popular OEM and aftermarket Transmission Parts from top names like B & M, National, Imperial, and more. B & M Transmission Parts start at just $49.99 and boast an impressive 4.3 stars average rating from customers. National and Imperial also bring quality to the table, with Transmission Parts available starting at $10.99, and at an average 4.3 stars rating. With 2,006 customer reviews and counting, our 1978 GMC C25 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 1978 GMC C25 is always ready to roll. We’re committed to providing you with everything you need to keep your C25 in top shape, all in one place. Start shopping confidently below for your 1978 GMC C25!

Best-Selling Transmission Mounts for 1978 GMC C25s

Enhance the driving experience in your GMC with 6 quality Transmission Mount components, starting at $9.29.

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Energy Suspension High-Performance Transmission Mount, 3.1108G

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$46.49

A true performance application component for cars, trucks, hot rods. For 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.

Anchor Transmission Mount: Rear, 1 Piece, 2378

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$11.99

Anchor 2378 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.

Anchor Transmission Mount: Rear, 1 Piece, 2268

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$9.29

Anchor 2268 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.

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$55.99

Energy Suspension Transmission Mount, 3.1132R

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$105.99

Nolathane Transmission Mount Bushing Replacement, REV208.0002

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$40.99

Nolathane transmission mounts are designed for those that demand a tough product with no room for movement. Not recommended for street use.

Most Popular 1978 GMC C25 Transmission Bearings

Customize your GMC with 9 Transmission Bearings products like Countershaft Bearings, Transfer Shaft Bearing, and Automatic Transmission Differential Bearings, all priced under $36.49.

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$15.29

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

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$36.49

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

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$25.49

Manufactured with premium-grade steel, National cylindrical bearings are designed and engineered to meet OE specifications.

National Tapered Roller Bearing Cone, LM501349

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$22.29

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

Driveworks Taper Bearing Cone, S-M-88048

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$11.79

Value-priced bearing meets all cataloged application requirements.

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$8.39

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

Schaeffler Bearing - CRB (Cylindrical Roller Bearing), FC67147

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$30.99

We develop and produce high-quality roller bearings, spherical bearings, and plain bearings worldwide for a wide range of applications.

Schaeffler Bearing - TRB (Tapered Roller Bearing), KT36

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$28.99

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$21.99

Top Picks for 1978 GMC C25 Transmission Seals

Upgrade GMC C25s with top-quality Transmission Seals parts, including 29 OEM and aftermarket selections for your 1978 model.

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$13.29

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$12.99

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$4.99

Value-priced seal meets all cataloged application requirements.

ATP Automatic Transmission Selector Shaft Seal, SO-19

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$9.59

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

ATP Automatic Transmission Fluid Filler Tube Seal, JO-15

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$4.29

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

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$24.79

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$7.99

ATP Automatic Transmission Dipstick Tube Seal, SO-35

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$6.39

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

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$6.99

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$12.79

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$7.79

Value-priced seal meets all cataloged application requirements.

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$21.29

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$6.49

Value-priced seal meets all cataloged application requirements.

ATP Automatic Transmission Dipstick Tube O'Ring Seal, SO-33

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$2.99

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

ATP Automatic Transmission Extension Housing Seal, HO-9

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$12.99

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

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$9.59

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

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$3.19

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

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$5.99

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$12.99

ATP Automatic Transmission Speedometer Pinion Seal, SO-34

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$10.79

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

ATP Automatic Transmission Speedometer Pinion Seal, SO-38

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$6.39

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

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$50.99

Motive Gear Differential Pinion Seal, 26064030

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$23.99

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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$14.49

Value-priced seal meets all cataloged application requirements.

In-Demand Automatic Transmission Parts for 1978 GMC C25s

Select from 24 premium Automatic Transmission Parts parts for your 1978 GMC C25, with prices ranging from $4.19 to $318.99.

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Pro-King Automatic Transmission Vacuum Modulator, MD-48

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$21.99

Fully adjustable vacuum modulator to maintain accurate shift points.

Pro-King Automatic Transmission Vacuum Modulator, MD-28

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$33.99

Fully adjustable vacuum modulator to maintain accurate shift points.

Dorman - Help Clutch Pilot Bushing, 14650

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$11.99

This clutch pilot bushing is designed to match the fit and function of the original part on specified vehicles. Made of quality materials, it is engineered for reliable performance.

"Mr. Gasket Chrome Automatic Transmission Dipstick & Tube - 27"" Length, 9764"

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$36.99

Includes dipstick with chromed steel handle and chromed steel dipstick tube with mounting tab. 27 inch long.

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$51.99

The B&M vacuum modulator is fully adjustable and allows you to fine-tune your shift points and shift feel. This is done by turning the adjustment screw inside of the vacuum line connection for more or less diaphragm preload, thus raising or lowering part throttle shift points and line pressures. For GM TH350 and TH400 automatic transmissions.

ATP Automatic Transmission Detent Cable, Y-100

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$25.99

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.

ATP Automatic Transmission Detent Cable Seal, SO-36

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$4.19

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

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$7.29

This clutch pilot bushing is designed to match the fit and function of the original part on specified vehicles. Made of quality materials, it is engineered for reliable performance.

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$51.99

ATP AT MODULATOR VALVE, JX-76. DRIVELINE – TRANSMISSION PARTS>TRANSMISSION PARTS>TRANSMISSION CONTROL MODULES>TRANSMISSION CONTROL MODULES from ATP

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$54.99

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$21.99

ATP AT MODULATOR VALVE, JX-66. DRIVELINE – TRANSMISSION PARTS>TRANSMISSION PARTS>TRANSMISSION CONTROL MODULES>TRANSMISSION CONTROL MODULES from ATP

ATP Automatic Transmission Front Pump Bushing, CB-4

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$11.79

ATP Transmission Components are exact fit, no compromise replacement parts

Edelbrock Throttle & Auto Trans Kickdown Bracket, 8030

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$83.99

Edelbrock part No: 8030 Throttle, Cruise Control & Trans. Kick-Down Mounting Bracket is designed for Small-block Chevy (1995 & earlier – non-Vortec) with Chrome Plated Finish.

Carquest Automatic Transmission Modulator Valve, VMC1023

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$48.99

Hooker BlackHeart Transmission Cross member, BHS550

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$318.99

The Hooker BlackHeart BHS550 is a purpose-built transmission cross member designed for GM LS and Gen V LT engine swaps into classic GM trucks and SUVs. It’s engineered to support 700R4, 4L60, 4L60E, and 4L65E transmissions, offering a bolt-in solution with excellent exhaust clearance and proper driveline geometry.

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$311.99

Hooker BlackHeart Transmission Cross member, BHS548

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$299.99

These new cross members have been redesigned and are less expensive than the previous cross member & work with engine mounting brackets BHS540 for both the GM LS & Gen-V LT engines. Choose the cross member based on the transmissions that you want to run in your 1973-1987 C10:

B & M Aluminum Braided Dip Stick, Fits Th-400 Transmission, 22166

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$132.99

Dress up your street rod with this stainless steel braided dipstick featuring a billet aluminum knob with an o-ring for a leak proof seal. The dipstick fits GM TH400 automatic transmissions and mounts to the Bell housing. The handle has the B&M logo laser etched on the top showing everyone you appreciate quality.

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$118.99

ATP AT CONTR SOLENOID, SE-1. DRIVELINE – TRANSMISSION PARTS>TRANSMISSION PARTS>SOLENOIDS>SOLENOIDS from ATP

B & M Kickdown Switch Kit For Th400 Transmission, 20297

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$103.99

When swapping the TH400 transmission into any vehicle, this kit makes installation of the transmission’s kickdown feature a snap. This switch mounts to either a TH700R4, TH200, TH200-R4 or TH350 throttle cable bracket.

Hooker BlackHeart Polyurethane Transmission Mount - Red, 71223030HKR

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$49.99

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.

Hooker BlackHeart Polyurethane Transmission Mount - Black, 71223029HKR

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$46.09

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.

ATP Automatic Transmission Band (Front), JX-58

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$29.99

ATP Transmission Components are exact fit, no compromise replacement parts

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$13.79

ATP Transmission Components are exact fit, no compromise replacement parts

Most Sold 1978 GMC C25 Transmission Cooler and Parts

Explore our best-selling GMC parts for the 1978 C25 among 15 OEM and aftermarket options starting from $11.99.

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Imperial High Performance Transmission Oil Cooler, 240516

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$77.99

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.

Imperial Maxi-Kool XL Transmission Oil Cooler, 243007

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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.

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$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.

Imperial Econo-Kool Transmission Oil Cooler, 242010

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$51.99

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.

Imperial Econo-Kool Transmission Oil Cooler, 242009

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$39.99

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.

Imperial Maxi-Kool XL Transmission Oil Cooler, 243012

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$90.99

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

Imperial Econo-Kool Transmission Oil Cooler, 241018

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$60.99

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.

"Imperial Plate and Fin Style Transmission Cooler, Heavy Duty, 3/4"" x 9-1/2"" x 11"", 243008"

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$91.99

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

Imperial Transmission Line Fitting Kit, 240390

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$16.99

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.

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$54.99

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.

Imperial High Performance Transmission Oil Cooler, 240514

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$81.99

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.

Imperial Transmission Oil Cooler Reinstallation Kit, 248002

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$21.99

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.

Imperial High Performance Transmission Oil Cooler, 240512

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$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.

Imperial Econo-Kool Transmission Oil Cooler, 242016

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$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.

Imperial Transmission Oil Cooler, 241015

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$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.

Top-Rated Transmission Parts Brands For Your 1978 GMC C25

Shop for the best-rated brands offering Transmission Parts and other products for your 1978 GMC C25s. Below you’ll find some of our best rated Transmission Parts from B & M, National, and Imperial, and more. Transmission Parts from these brands that fit a 1978 C25 start at just $10.99 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 B & M 1978 GMC C25 Transmission Parts

When it comes to maintaining or upgrading your 1978 GMC C25, using quality Transmission Parts is essential to ensure durability and a perfect fit. B & M ticks all of those boxes. We offer a wide selection of B & M Transmission Parts, specifically designed for the 1978 GMC C25. With over 3 B & M brand Transmission Parts in stock, you’re sure to find what you need. The prices for these top-notch parts start as low as $49.99, with an average price of just $264.66. Plus, with over 3 customer reviews and an average rating of 4.3 stars, you can trust that our B & M 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.

B & M Bracket And Lever Kit Fits Th400/Th350/Th250/200-4R/700R4, 4L60E, 35498

from $49.99

(1)

B & M Bracket And Lever Kit Fits Th400/Th350/Th250/200-4R/700R4, 4L60E, 35498

“Cable not perfectly straight. It is hard to believe as long as B&M and th400s have been around, that they do not line up better”

B & M Automatic Shifter - Starshifter - Universal, 80675

from $363.99

(1)

B & M Automatic Shifter – Starshifter – Universal, 80675

“while I was looking this shifter over and found it wouldn’t work for my application, I found it to be as beautiful as the B&M shifter I had in my othe”

B & M Automatic Shifter - Sport Shifter - Universal, 80776

from $379.99

(1)

B & M Automatic Shifter – Sport Shifter – Universal, 80776

“This is a sweetly made product with that hotrod look and feel.This shifter was easy to install and a knock out to drive.No down falls as far as I’m aw”

Popular National 1978 GMC C25 Transmission Parts

National auto parts is one of the highest quality Transmission Part brands in the market. Any 1978 GMC C25 owner should feel confident when installing genuine National parts in their vehicle. To ensure the best fit and performance for your 1978 C25, Advance Auto Parts carries a full inventory of 3 National Transmission Parts. Plus you will be keeping your GMC in peak condition while saving money because prices on these National Transmission Parts range from $10.99 to $15.29, plus, with more than 9 customer reviews and an impressive 4.3 stars average rating, you can be confident the Fram Transmission Parts below will deliver on both quality and value.

from $10.99

(4)

National Multi-Purpose Seal, 6712NA

“it worked”

from $13.29

(2)

National Multi-Purpose Seal, 9449

“Sealed tbe trams leak perfectly”

from $15.29

(3)

National Bearing Race, M802011

“good product,”

FAQs for 1978 GMC C25 Transmission Parts

Which Transmission Parts are best-sellers for 1978 GMC C25s?

Out of 154 Transmission Parts that fit 1978 GMC C25s, the following parts are the top sellers:

Imperial Mounting Kit System, 226201 (6014844) – $11.99
National Multi-Purpose Bearing, A-35 (3275876) – $36.49
National Wheel Bearing, 5707 (15050070) – $25.49

What’s the price range for 1978 GMC C25 Transmission Parts?

Transmission Part prices for the 1978 GMC C25 start at $1.89 and go up to $1,400.00 for the most premium parts.

What’s the average price of a Transmission Part for a 1978 GMC C25?

The average price for Transmission Parts for the 1978 GMC C25 is $193.49. 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 C25 model years?

Yes, we currently carry Transmission Parts for 2 model years of GMC C25s between 1975 and 1977. Transmission Parts are bought most frequently for the following model years: 1977, 1976, and 1975.

What are the cheapest Transmission Parts for my 1978 GMC C25?

The cheapest 1978 GMC C25 Transmission Parts we carry in stock are:

Pro-King Differential Ring Gear Bolt, 744A935 (10282457) – $1.89
ATP Automatic Transmission Dipstick Tube O’Ring Seal, SO-33 (11236112) – $2.99
ATP Automatic Transmission Speedometer Pinion Seal, SO-13 (11236107) – $3.19
Schaeffler Shaft Seal, SS2569 (50211164) – $3.99
ATP Automatic Transmission Detent Cable Seal, SO-36 (10861007) – $4.19

What are the top-rated Transmission Parts that fit the 1978 GMC C25?

Out of 2,006 reviews by customers, our 1978 GMC C25 Transmission Parts have an average customer rating of . These are some of the highest-rated Transmission Part types for the 1978 GMC C25 and their top-rated products:

Automatic Transmission Pan and Gaskets
- Felpro Transmission Oil Pan Gasket 13 Bolt Hole One Piece Gasket, TOS 18633 (5181054) – $9.99
- Felpro Transmission Oil Pan Gasket 13 Bolt Hole One Piece Gasket, TOS 18621 (5181011) – $10.49
- Mr. Gasket Automatic Transmission Oil Pan, 9761 (17360643) – $78.49
Transmission Bearings
- Felpro Transmission Oil Pan Gasket 13 Bolt Hole One Piece Gasket, TOS 18633 (5181054) – $9.99
- Felpro Transmission Oil Pan Gasket 13 Bolt Hole One Piece Gasket, TOS 18621 (5181011) – $10.49
- Mr. Gasket Automatic Transmission Oil Pan, 9761 (17360643) – $78.49

What types of Transmission Parts do you sell for my 1978 GMC C25?

As of 8/2/26, these are some of the most in-demand types of Transmission Parts for a 1978 GMC C25:

Can I get help with 1978 GMC C25 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 C25 Transmission Parts?

Advance Auto Parts keeps returns simple. For new GMC C25 Transmission Parts and accessories, your online orders can be returned, in their original condition, within 45 days. For requirements, see the returns page.

1978 GMC C25 Transmission Parts

Energy Suspension – Energy Suspension Transmission Mount, 3.1158G (Part No.3.1158G)

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

ACDelco – ACDelco Neutral Safety Switch, D2219C (Part No.D2219C)

B & M – B & M Automatic Shifter, Pro Ratchet 3 And 4 Speed, 80843 (Part No.80843)

ATP – ATP Automatic Transmission Clutch Plate, JC-57 (Part No.JC-57)

ATP – ATP Automatic Transmission Universal Detent Cable 28 To 48 Inches, Y-754 (Part No.Y-754)

ATP – ATP Automatic Transmission Extension Housing Seal, SO-22 (Part No.SO-22)

Driveworks – Driveworks Oil Seal, S-9449 (Part No.S-9449)

Felpro – Felpro Transmission Oil Pan Gasket 13 Bolt Hole One Piece Gasket, TOS 18633 (Part No.TOS 18633)

Victor Reinz – Victor Reinz Transmission Oil Pan Gasket, 71-14938-00 (Part No.71-14938-00)

Driveworks – Driveworks Oil Seal, S-9613S (Part No.S-9613S)

National – National Multi-Purpose Seal, 9613S (Part No.9613S)

National – National Multi-Purpose Seal, 5208 (Part No.5208)

ATP – ATP Automatic Transmission Oil Pump Gasket, SG-27 (Part No.SG-27)

B & M – B & M Converter Lockup Control For Gm Automatic Trans With Lockup Converter, 70248 (Part No.70248)

B & M – B & M Cable Bracket, 30499 (Part No.30499)

Pro-King – Pro-King Differential Ring Gear Bolt, 744A935 (Part No.744A935)

Imperial – Imperial Econo-Kool Transmission Oil Cooler, 242012 (Part No.242012)

Felpro – Felpro Manual Transmission Gasket Set, TS 80161 (Part No.TS 80161)

Driveworks – Driveworks Oil Seal, S-6712NA (Part No.S-6712NA)

Hooker BlackHeart – Hooker BlackHeart Transmission Cross member, BHS549 (Part No.BHS549)

Pro-King – Pro-King Automatic Transmission Deluxe Rebuild Kit, KS-15 (Part No.KS-15)

ATP – ATP Automatic Transmission Speedometer Pinion Seal, SO-13 (Part No.SO-13)

Schaeffler – Schaeffler Cone, KLM603049 (Part No.KLM603049)

Carquest Premium – Carquest Automatic Transmission Modulator Valve, VMC1051 (Part No.VMC1051)

National – National Bearing Race, M802011 (Part No.M802011)

National – National Engine Crankshaft Seal, 5092 (Part No.5092)

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

Energy Suspension – Energy Suspension High-Performance Transmission Mount, 3.1108G (Part No.3.1108G)

Anchor – Anchor Transmission Mount: Rear, 1 Piece, 2378 (Part No.2378)

Anchor – Anchor Transmission Mount: Rear, 1 Piece, 2268 (Part No.2268)

Energy Suspension – Energy Suspension Transmission Mount, 3.1158G (Part No.3.1158G)

Energy Suspension – Energy Suspension Transmission Mount, 3.1132R (Part No.3.1132R)

Nolathane – Nolathane Transmission Mount Bushing Replacement, REV208.0002 (Part No.REV208.0002)

National – National Bearing Race, M802011 (Part No.M802011)

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

National – National Wheel Bearing, 5707 (Part No.5707)

National – National Tapered Roller Bearing Cone, LM501349 (Part No.LM501349)

Driveworks – Driveworks Taper Bearing Cone, S-M-88048 (Part No.S-M-88048)

National – National Bearing Race, LM501310 (Part No.LM501310)

Schaeffler – Schaeffler Bearing – CRB (Cylindrical Roller Bearing), FC67147 (Part No.FC67147)

Schaeffler – Schaeffler Bearing – TRB (Tapered Roller Bearing), KT36 (Part No.KT36)

Schaeffler – Schaeffler Cone, KLM603049 (Part No.KLM603049)

National – National Multi-Purpose Seal, 9449 (Part No.9449)

National – National Multi-Purpose Seal, 5200 (Part No.5200)

Driveworks – Driveworks Oil Seal, S-9613S (Part No.S-9613S)

ATP – ATP Automatic Transmission Selector Shaft Seal, SO-19 (Part No.SO-19)

ATP – ATP Automatic Transmission Fluid Filler Tube Seal, JO-15 (Part No.JO-15)

National – National Differential Pinion Seal, 2286 (Part No.2286)

National – National Multi-Purpose Seal, 9613S (Part No.9613S)

ATP – ATP Automatic Transmission Dipstick Tube Seal, SO-35 (Part No.SO-35)

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

National – National Multi-Purpose Seal, 3638 (Part No.3638)

Driveworks – Driveworks Oil Seal, S-9449 (Part No.S-9449)

National – National Multi-Purpose Seal, 5208 (Part No.5208)

Driveworks – Driveworks Oil Seal, S-6712NA (Part No.S-6712NA)

ATP – ATP Automatic Transmission Dipstick Tube O’Ring Seal, SO-33 (Part No.SO-33)

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

ATP – ATP Automatic Transmission Extension Housing Seal, SO-22 (Part No.SO-22)

ATP – ATP Automatic Transmission Speedometer Pinion Seal, SO-13 (Part No.SO-13)

National – National Multi-Purpose Seal, 240735 (Part No.240735)

National – National Multi-Purpose Seal, 410085 (Part No.410085)

ATP – ATP Automatic Transmission Speedometer Pinion Seal, SO-34 (Part No.SO-34)

ATP – ATP Automatic Transmission Speedometer Pinion Seal, SO-38 (Part No.SO-38)

National – National Engine Crankshaft Seal, 5092 (Part No.5092)

Motive Gear – Motive Gear Differential Pinion Seal, 26064030 (Part No.26064030)

Driveworks – Driveworks Oil Seal, S-2286 (Part No.S-2286)

Pro-King – Pro-King Automatic Transmission Vacuum Modulator, MD-48 (Part No.MD-48)

Pro-King – Pro-King Automatic Transmission Vacuum Modulator, MD-28 (Part No.MD-28)

Dorman – Help – Dorman – Help Clutch Pilot Bushing, 14650 (Part No.14650)

Mr. Gasket – "Mr. Gasket Chrome Automatic Transmission Dipstick & Tube – 27"" Length, 9764" (Part No.9764)

B & M – B & M Modulator, 20234 (Part No.20234)

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

ATP – ATP Automatic Transmission Detent Cable Seal, SO-36 (Part No.SO-36)

Dorman – Dorman Clutch Pilot Bushing, 690-014.1 (Part No.690-014.1)

ATP – ATP AT MODULATOR VALVE, JX-76 (Part No.JX-76)

ATP – ATP Automatic Transmission Universal Detent Cable 28 To 48 Inches, Y-754 (Part No.Y-754)

ATP – ATP AT MODULATOR VALVE, JX-66 (Part No.JX-66)

ATP – ATP Automatic Transmission Front Pump Bushing, CB-4 (Part No.CB-4)