1978 GMC Jimmy Differentials

Essential 1978 GMC Jimmy Differentials

Pro-King – Differential Internal Nest Kit (Part No.742J717)

Differential Internal Nest Kit

from

$219.99
Pro-King is the leading supplier of transmission and driveline products in the aftermarket.

Product Features:
  • All products are designed to meet or exceed OE quality, form, fit and funtion.
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Dorman – Rear Differential Cover (Part No.697-701)

Rear Differential Cover

from

$20.99
This direct replacement differential cover matches the fit and function of the original equipment diff cover for a reliable, leak-free repair. It features a durable design, made to strict specifications, to help ensure reliable service life.

Product Features:
  • Direct replacement – this differential cover matches the fit and function of the original equipment diff cover on select vehicles.
  • Reliable repair – the smart solution for fixing an existing cover that’s rusted, damaged or leaking differential fluid.
  • Durable construction – this differential cover is made according to strict engineering standards to help ensure dependability
  • Trustworthy quality – backed by a team of product experts in the United States and more than a century of automotive experience
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Felpro – DIFFERENTIAL GASKET (Part No.RDS 6095-1)

DIFFERENTIAL GASKET

from

$8.29
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
  • Unsurpassed quality you can trust
  • Validated for fit, form and function
  • Each Fel-Pro gasket, no matter how small, is engineered to exacting standards with proprietary design, engineering and manufacturing processes
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Dorman – Help – Differential Shaft Lock Bolt (Part No.81048)

Differential Shaft Lock Bolt

from

$5.99
This differential pinion shaft lock bolt 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.

Product Features:
  • Direct replacement – this differential pinion shaft lock bolt matches the fit and function of the factory part on specified years, makes and models.
  • Ideal solution – this bolt is a reliable replacement for an original part that is missing or has failed due to 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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Pro-King – Differential Cross Shaft (Part No.742G673)

Differential Cross Shaft

from

$28.49
Pro-King is the leading supplier of transmission and driveline products in the aftermarket.

Product Features:
  • All products are designed to meet or exceed OE quality, form, fit and funtion.
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Motive Gear – Crush Sleeve (Part No.1234726)

Crush Sleeve

from

$4.29
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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Royal Purple – HMX SAE 5W-30 High-Mileage Synthetic Engine Oil (1 Quart) (Part No.11744)

HMX SAE 5W-30 High-Mileage Synthetic Engine Oil (1 Quart)

from

$12.99
Royal Purple HMX SAE 5W-30 High-Mileage Synthetic Motor Oil, 1 quart is specifically designed to minimize wear and restore lost performance in engines with more than 75,000 miles. Formulated with robust zinc/phosphorus anti-wear compounds combined with Royal Purple’s proprietary additive technology Synerlec, HMX is chemically enhanced to revitalize hardened seals, reducing oil consumption common in high-mileage engines. In addition, HMX is fortified with stout detergents to remove engine build-up and deposits, maintain cleanliness and promote engine longevity.

Product Features:
  • Specifically designed to minimize wear and restore lost performance in engines with more than 75,000 miles
  • Formulated with robust zinc/phosphorus anti-wear compounds combined with royal purple’s proprietary additive technology
  • Hmx is chemically enhanced to revitalize hardened seals, reducing oil consumption common in high-mileage engines
  • Reduces friction and metal-to-metal contact for peak engine performance
  • Also provides outstanding oxidation resistance to safely extend oil drain intervals, and an ionic attraction to metal surfaces, providing protection and minimizing wear at start-up
  • High-Mileage Formula: Specifically designed for engines with more than 75,000 miles, this full synthetic engine oil helps minimize wear and restore lost performance.
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Motive Gear – Differential Carrier Gear Kit (Part No.GM9.5BI)

Differential Carrier Gear Kit

from

$176.99


Product Features:
  • GM9.5″ INTERNAL KIT (OPEN) 33 SPL. FRONT & REAR
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Pro-King – Differential Ring Gear Bolt (Part No.742J935)

Differential Ring Gear Bolt

from

$0.91
Pro-King is the leading supplier of transmission and driveline products in the aftermarket.

Product Features:
  • All products are designed to meet or exceed OE quality, form, fit and funtion.
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National – Bearings (Part No.02420)

Bearings

from

$16.99
National Oil Seals & Bearings offer a full line of premium oil seals and bearings.

Product Features:
  • Premium bearing design matches OEM specifications
  • Precision manufactured using premium-grade steel for outstanding durability and performance
  • Crowned raceways and rollers to ensure even load distribution for maximum life
  • Industry leading coverage
  • Professional technicians know they can depend on National
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Richmond Gear – Differential Mini Spool (Part No.78-1028-1)

Differential Mini Spool

from

$124.99
Richmond Gear is the leading manufacturer of professional quality, high-performance drivetrain products. Our complete line of products ranges from high performance ring-and-pinion sets for serious street and racing applications to torque-hungry manual transmissions and components. Richmond Gear products have been winners both at the Daytona 500 and U.S. Nationals for decades. WINNERS RUN RICHMOND!

Product Features:
  • For over 80-years, the Richmond Double-Diamond logo has represented some of the highest quality gears in the racing industry. Winners Run Richmond!
  • The superior quality of Richmond gearsets is a result of outstanding design, world class manufacturing and an extensive testing process that is performed on all products.
  • Richmond performance gearsets have been winners for decades at: NHRA, NMRA, NMCA, Daytona 500, WISSOTA and U.S. Nationals.
  • Richmond Gear is a leading manufacturer of high performance ring and pinion gearsets and drivetrain components, backed by a two year warranty.
  • Engineered to perform faster and be more reliable, Richmond performance drivetrain products are the result of a continuous research and development program combined with state-of-the-art manufacturing capabilities.
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National – Bearings (Part No.M802048)

Bearings

from

$23.99
National Oil Seals & Bearings offer a full line of premium oil seals and bearings.

Product Features:
  • Premium bearing design matches OEM specifications
  • Precision manufactured using premium-grade steel for outstanding durability and performance
  • Crowned raceways and rollers to ensure even load distribution for maximum life
  • Industry leading coverage
  • Professional technicians know they can depend on National
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Yukon Gear – Positraction Internals For 8.5" GM With 28 Spline Axles (Part No.16052)

Positraction Internals For 8.5" GM With 28 Spline Axles

from

$336.99
Yukon positraction internals (0.795″ diameter) for 8.5″ GM with 28 spline axles. Yukon uses higher quality materials and better techniques than OEM to ensure a longer lasting spider gear set. This kit does not include clutches. All components come with a one year warranty against manufacturing defects. This kit is compatible with Yukon Dura Grip or Eaton positractions. It will not fit a factory Gov-Loc positraction.

Product Features:
  • Spider gear kit
  • Fits GM 8.5″ with 28 spline Dura Grip positraction
  • Includes two side gears, four pinion gears, cross pin shaft, roll pin and spider gear thrust washers.
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Dorman – Differential Ring And Pinion Set (Part No.697-301)

Differential Ring And Pinion Set

from

$316.99
This differential ring and pinion directly replaces the original equipment on specific vehicle years, makes and models.

Product Features:
  • Direct replacement – this ring and pinion set matches the fit and function of the original components on certain vehicle applications.
  • Effective fix – eliminates grinding and whining from failed original bearings.
  • Thoroughly tested – vehicle try-on testing and rigorous quality control measures ensure longevity
  • Trustworthy quality – backed by team of designers and engineers in the United States
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Driveworks – Oil Seal (Part No.S-9316)

Oil Seal

from

$3.99
Value-priced seal meets all cataloged application requirements.

Product Features:
  • Brand may vary by location
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Motive Gear – Differential Mini Spool (Part No.MS7.5-28)

Differential Mini Spool

from

$101.99


Product Features:
  • MINI SPOOL GM 7 1/2″ 28 SPLINE
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Motive Gear – OEC GM 7.6" 28 SPL 3.23-UP (Part No.GM7.6E)

OEC GM 7.6" 28 SPL 3.23-UP

from

$138.99
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.
See More

National – Shaft Repair Sleeve (Part No.99152)

Shaft Repair Sleeve

from

$38.99
National® has built a reputation as one of the most respected names in the industry. We have offered premium sealing solutions for more than 75 years. Our design team keeps pace with the industry and provides advanced solutions for today’s vehicles.

Product Features:
  • Designed to repair damaged, grooved or worn shafts
  • Durable stainless steel construction for corrosion-free sealing surface that surpasses most original shaft specifications
  • Ideal for a shaft where indications of seal wear, such as tracks or grooves have developed
  • Ultra-thin construction (0.01/0.25mm wall thickness) allows original seal size to be used with minimal additional lip loading
  • Easy to install with removable flange and installation tool
  • Installation tool reduces sleeve distortion and allows for installation without removal from the shaft
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Felpro – DIFFERENTIAL GASKET (Part No.RDS 55075)

DIFFERENTIAL GASKET

from

$8.29
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
  • Unsurpassed quality you can trust
  • Validated for fit, form and function
  • Each Fel-Pro gasket, no matter how small, is engineered to exacting standards with proprietary design, engineering and manufacturing processes
See More

Pro-King – Differential Pinion Gear Washer (Part No.742G216)

Differential Pinion Gear Washer

from

$2.59
Pro-King is the leading supplier of transmission and driveline products in the aftermarket.

Product Features:
  • All products are designed to meet or exceed OE quality, form, fit and funtion.
See More

FAG US – TAPERED ROLLER BEARI (Part No.KT45)

TAPERED ROLLER BEARI

from

$24.29
TAPERED ROLLER BEARI

Motive Gear – Axle Shaft (Part No.GM10FAXL)

Axle Shaft

from

$259.99
The Motive Gear replacement axle shaft offers an OE-quality axle shaft at a fraction of the OE cost. Manufactured from 1541H material on high-tolerance CNC equipment, this axle shaft is designed to provide a perfect fit every time.

Product Features:
  • GM 10BL 8.5 AXLE LEFT SIDE, 77-87
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Pro-King – Differential Cover Gasket (Part No.742G303A)

Differential Cover Gasket

from

$31.49
Pro-King is the leading supplier of transmission and driveline products in the aftermarket.

Product Features:
  • All products are designed to meet or exceed OE quality, form, fit and funtion.
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ATP – Remanufactured Front Differential Assembly (Part No.111503)

Remanufactured Front Differential Assembly

from

$3289.99
Brand new units are no longer available. ATP’s fully remanufactured differentials offer the best alternative to bench rebuilding or buying used. They are carefully inspected and totally reconditioned to meet original specifications and include new bearings and seals. Our units are ready to install, just add oil.

Product Features:
  • Ready to install, just add oil
  • Totally reconditioned
  • New bearings
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Powertrax – Grip LS Traction System (Part No.LS231230)

Grip LS Traction System

from

$480.99
For vehicles that are driven daily, the Powertrax No-Slip Traction System is the latest design in quiet traction-adding differential technology. It combines the automatic street-friendly smooth operation of a limited-slip differential with the traction performance of a locking differential. The Powertrax No-Slip locker easily installs in to your differential carrier using basic tools and without affecting your ring and pinion settings. Powertrax Grip-Lok, Lock-Right Lockers and No-Slip Traction Systems automatically provide 100% traction on-demand, under the toughest circumstances. The Powertrax Grip-Pro and Grip-LS performance limited slips offer smooth dependable torque transfer and traction for the best of both worlds!
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Dorman – Ring And Pinion Bearing Installation Kit (Part No.697-100)

Ring And Pinion Bearing Installation Kit

from

$195.99
This differential bearing kit includes all necessary installation components for a differential ring and pinion on certain vehicle years, makes and models.

Product Features:
  • Convenient kit – this ring and pinion bearing installation kit includes all necessary components for a complete repair on certain vehicle applications.
  • Related repair – smart to have on hand when installing a differential ring and pinion.
  • Durable construction – built for reliable longevity, free of defects in materials and workmanship
  • Trustworthy quality – backed by team of designers and engineers in the United States
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Motive Gear – Differential Gear Install Kit (Part No.GM7.5IK)

Differential Gear Install Kit

from

$49.99


Product Features:
  • MINI INSTALL KIT GM 7.5
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Yukon Gear – Bearing Race Driver (Part No.56020)

Bearing Race Driver

from

$215.99
Bearing race driver. No return.

Product Features:
  • Bearing race driver
  • Fits M802011 race
  • All steel construction
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1978 GMC Jimmy Differentials

Maybe you’re in the middle of a full rebuild of that 1978 GMC Jimmy. Maybe you just need a couple of Differentials. Either way, Advance Auto Parts has 153 different Differentials in our inventory ranging from $0.91 to $1,566.99. That means you can find the exact parts or products you need to keep that 1978 GMC Jimmy running smoothly.

Differentials are only as good as their brand. We stock 13 different brands to make sure you have plenty of trusted parts to choose from for your 1978 GMC Jimmy. Valvoline, FELPRO, and National are just some of the brands we stock. Search for brands you know or compare prices and reviews to help you decide!

We know you’ll find the perfect Differentials for your 1978 GMC Jimmy, but don’t take our word for it – read our customer ratings and reviews and buy with confidence. Out of the 1,144 reviews in this category, some of the top rated parts include Differential Ring And Pinion with 5.0 stars and Differential Ring and Pinion with 4.5 stars.

So if you’re in the market for aftermarket Differentials to keep your 1978 GMC Jimmy rolling for years to come, look no further. Shop online and have your products shipped direct to your door, or pick up at the nearest Advance Auto Parts location today!

Differentials Brands To Make Your 1978 GMC Jimmy Last

Simple repair, complete replacement, or a full rebuild. No matter the job, your 1978 GMC Jimmy demands trusted brand parts and products to keep it running. Many trusted brands of Differentials make up Advance Auto Parts’ inventory, and all are ready to help make your Jimmy the best it can be. Be sure to browse some of our top Differentials brands and parts.

Top 1978 GMC Jimmy Differentials from Felpro

Felpro products are another trusted brand when it comes to Differentials for your 1978 GMC Jimmy. Popular Felpro parts include:
Differential Cover Gasket
from $9.99
(195)
Differential Cover Gasket
Rear Differential Cover Gaskets
Axle Housing Cover Gasket
from $6.49
(10)
Axle Housing Cover Gasket
Rear Housing Cover Gaskets
DIFFERENTIAL GASKET
from $7.99
(3)
DIFFERENTIAL GASKET
Rear Housing Cover Gaskets

FAQs for 1978 GMC Jimmy Differentials

What are the most purchased Differentials for the 1978 GMC Jimmy?

Out of 153 Differentials for the 1978 GMC Jimmy, the most popular in our inventory are:
3 Qt - 80W90 Conventional Gear Oil With Posi Additive
from $57.99
This product is not rated
3 Qt – 80W90 Conventional Gear Oil With Posi Additive
Differential Oil
Bearings
from $23.99
(7)
Bearings
Front Differential Pinion Bearings
Differential Shaft Lock Bolt
from $5.99
(11)
Differential Shaft Lock Bolt
Differential Pinion Shaft Lock Bolts

What are the top-rated 1978 GMC Jimmy Differentials?

Top-rated Differentials for your 1978 GMC Jimmy based on customer reviews/ratings are:
Differential Ring And Pinion
from $350.99
(7)
Differential Ring And Pinion
“Great spark plugs.”
Differential Ring and Pinion
from $241.99
(4)
Differential Ring and Pinion
“Perfect match and easy install”
Multi Purpose Seal
from $23.29
(4)
Multi Purpose Seal
“Works well fit right in. Love national seals”