1978 Pontiac Grand Prix Differentials

Name: Differential Cover Gasket
Brand: Pro-King
SKU: 742G303A
Price: 31.49 USD

Find your specific 1978 Pontiac Grand Prix original or aftermarket Differentials below. Order your parts online and have delivered to your home or pick up in-store at Advance Auto.

Essential 1978 Pontiac Grand Prix Differentials

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$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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$689.99

The Yukon carrier bearing Puller works with an impact gun to quickly and safely remove carrier bearings without damaging them. This unit comes with a handy bench top stand and works with up to most standard one ton applications. This unit is works with differentials up to one-ton applcations. It is not compatible with Dana 70HD, Dana 80, 10.25″ & 10.5″ Ford, or GM & Chrysler 11.5″ differentials.

Product Features:

Carrier bearing puller
Works with an impact gun to safely and easliy remove carrrier bearings
Not compatible with Dana 70HD, Dana 80, Ford 10.25″ and 10.5″ or Gm and Chrysler 11.5″ applications

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$26.49

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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$9.49

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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$153.99

Yukon Minimum installation kits are a low cost solution for gear changes in newer vehicles where the bearings can be reused. This kit uses all high quality components to ensure a smooth set up. kit includes a pinion seal, crush sleeve (if applicable), complete shim kit, marking compound and brush.

Product Features:

Fits 8.2″ Buick, Oldsmobile and Pontiac
Included are a pinion seal, crush sleeve, complete shim kit, marking compound and brush.

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$75.99

The Mr. Gasket chrome plated rear end cover is made from heavy-gauge steel, and comes complete with bolts and gaskets.

Product Features:

Chrome plated steel for looks
Includes bolts and gasket

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$3.99

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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$156.99

Product Features:

Spider gear kit
Fits GM 7.5″ 26 spline open differential
Includes two side gears, two pinion gears, cross pin shaft, cross pin bolt and spider gear thrust washers.

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$10.99

8.5″ & 8.6″ GM standard Open pinion gear Thrust washer. also fits 8.5″ Eaton with 0.795″ cross pin.

Product Features:

Pinion gear thrust washer for GM 8.5″ and 8.6″
Fits standard open differentials only
0.795″ I.D.

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$8.99

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

from

$217.99

Yukon standard open spider gear kit 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. All components come with a one year warranty against manufacturing defects.

Product Features:

Spider gear kit
Fits GM 8.5″ open differential with 28 spline axles
Includes two side gears, two pinion gears, cross pin shaft, cross pin bolt and spider gear thrust washers.

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$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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$419.99

Yukon Ring & Pinion sets give you the confidence of knowing you’re running gears designed for the harshest of conditions. Whether it’s on the street, off-road, or at the track; Yukon ring & pinion sets deliver unrivaled performance & quality. All Yukon ring & pinion sets come standard with a one-year warranty. This gear set uses 3/8″ bolts. Some factory gears use 7/16″ bolts. If your factory case uses 7/16″ bolts you will need to purchase YSPBLT-027 spacers.

Product Features:

Fits 8.2″ Buick, Oldsmobile and Pontiac
8.20″ ring gear diameter
27 spline pinion
10 ring gear bolts
3.36 ratio

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$39.99

8″ Toyota, 7.5″ GM, 8.2″ GM, 12T, pinion shim set, & Mazda truck.

Product Features:

Pinion depth shim kit for Toyota 7.5″, 8″ and V6

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$829.99

The Yukon Dura Grip provides aggressive yet smooth traction to give you the confidence & performance you need. Get longer life and better traction with the heavy duty Yukon Dura Grip Positraction. The Yukon Dura Grip uses a nodular case and forged 4320 internals for added strength along with composite clutches for high performance and long life. All units are Rebuildable and many offer upgrades to increase aggressiveness for racing applications. Each unit carries a one year warranty against defects.

Product Features:

Fits GM 7.625″ with 28 spline axles
3.23 ratio and up only
4-spring, clutch style positraction
Internal gears are manufactured using forged 4320 steel and cut to provide stronger teeth
Fully rebuildable
Assembled in the USA

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$6.49

This differential crush sleeve is designed to match the fit and function of the original sleeve on specified vehicles, and is engineered for durability and reliable performance.

Product Features:

Direct replacement – this differential crush sleeve is designed to match the fit and function of the original sleeve on specified vehicles.
Required replacement – when servicing the differential
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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$234.99

Yukon cast yoke for GM 8.5″ with a 1350 U/joint size. 3.625″ snap ring span, 1.188″ cap diameter. Outside snap ring. This yoke uses straps. All Yukon yokes come with a one year warranty against manufacturing defects.

Product Features:

Fits GM 8.5″
30 spline
1350 u-joint size
Outside snap ring design
3.625″ snap ring span
1.188″ cap diameter
Strap style

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$2.79

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.

from

$649.99

The Spartan Locker, by USA Standard Gear, provides reliable traction at a low cost. Give your vehicle great traction and save some cash. Choose a Spartan Locker for better traction. The Spartan locker by USA standard gear is a mechanical locker that replaces the spiders in a standard case. The Spartan locker’s design does not use the thrust washers and has a revolutionary spring and pin design that makes installation a snap! The couplers and drivers are made from 9310 steel, for added strength. Each Spartan locker carries a one year warranty against defect.

Product Features:

Fits GM 18.5″ with 28 spline axles
Made from 9310 steel for added strength
Replaces the spiders in a standard carrier case

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$289.99

If you’re repairing or rebuilding a front or rear differential and want the best performance and longevity from the bearings being replaced, choose this premium differential kit. It includes high-precision bearings manufactured to tighter tolerances and engineered to last longer than common lower-grade bearings that have more backlash when subjected to the torque generated within the differential. This convenient kit also saves the time needed to source individual components. Check the product attributes and fitment details to select the correct premium differential kit for your application.

Product Features:

Ideal solution – this premium differential bearing kit features high-precision bearings to help ensure longer bearing life, prevent backlash, and restore proper differential operation
Direct replacement – the components in this all-in-one kit are engineered to precisely match the fit and function of the original equipment bearings for a seamless installation
Increased reliability – the premium bearings in this kit are manufactured to exacting tolerances and specifications from high quality materials to help ensure optimal performance
Application-specific – check the product attributes and fitment details to choose the correct kit for your application

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$14.99

Pinion nut washer for GM 7.2″ IFS, 7.5″, 7.6″, 7.6″ IFS, 8.5″, 8.6″ & 9.5″.

Product Features:

Pinion nut washer for GM 7.2″ IFS, 7.5″, 7.625″, 7.6″ IFS, 8.5″, 8.6″ and 9.5″.

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$15.99

Standard open side gear thrust washer for 8.5″ GM.

Product Features:

Side gear thrust washer
Fits GM 8.5″

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$483.99

Product Features:

Clutch kit
Fits Ford 8.8″, 1963-1979 Corvette, GM 12 bolt passenger car and truck, 8.2″, 8.5″ and 8.6″ Dura Grip positraction
18 piece kit
Steel clutches

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$201.99

Yukon Pinion installation kits are a terrific solution for gear installation on lower mileage vehicles where the carrier bearings & races can be reused. This kit uses Timken bearings and races along with a high quality pinion seal and small parts. Included in this kit are the pinion bearings and races, pilot bearing (if applicable), crush sleeve (if applicable), complete pinion shim kit, pinion nut, thread locker, and marking compound with brush. Yukon does extensive research for each application to make sure your kit will arrive with all the correct parts you need to install your pinion gear.

Product Features:

Fits 1981 and down GM 7.5″
Included are pinion bearings and races, pinion seal, crush sleeve, complete pinion shim kit, and marking compound with brush.

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$889.99

Fits GM 7.5″ and 7.625″ with 26 spline axles
3.23 ratio and up only
4-spring, clutch style positraction
Internal gears are manufactured using forged 4320 steel and cut to provide stronger teeth
Fully rebuildable
Assembled in the USA

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$481.99

7.625″ GM standard Open case, 3.23 & up, Large & SM windows, loaded. 28 Spline.

Product Features:

Standard open carrier case and spiders
7.5″ & 7.625″ 28 spline applications
3.23 and up ratio only
Large and Small windows

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$64.49

Product Features:

MINI INSTALL KIT GM 12BLT 8.875 CAR

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$109.99

Yukon Carrier installation kits are great, low cost kit for carrier changes such as Positraction or locker upgrades. Carrier installation kit for GM 8.2″ & 8.5″ differential. This kit contains carrier bearings, races and shims.

Product Features:

Fits GM 7.5″, 7.625″ 8.2″ and 8.5″
Includes carrier bearings and races and “super” carrier shim kit

Popular 1978 Pontiac Grand Prix Differentials Categories

Differential Oil

Rear Differential Cover Gaskets

Differential Covers

Differential Pinion Shaft Lock Bolts

Differential Bearings

Differential Pinion Pilot Bearings

Differential Cover Bolts

Differential Carriers

Differential Bearing Kits

Front Differential Pinion Bearings

Differential Spider Gear Kits

Differential Rebuild Kits

Differential Carrier Shim Kits

Differential Pinion Seals

Differential Clutch Packs

Differential Ring and Pinions

Differential End Yokes

Rear Differential Pinion Bearings

Differential Spools

Differential Carrier Bearings

Differential Lock Springs

Differential Pinion Bearing Kits

Complete Differentials

Differential Ring Gear Bolts

Bearing Race Drivers

Differential Pinion Shafts

Differential Crush Sleeves

Differential Side Bearing Spacers

Differential Pinion Shims

Differential Pinion Shaft Nuts

Differential Gear Install Kits

Differential Cross Pins

Differential Side Gear Thrust Washers

Differential Pinion Gear Thrust Washers

Differential Pinion Gear Washers

Limited Slip Differential Assemblies

Differential Clutch Pack Clips

Maybe you’re in the middle of a full rebuild of that 1978 Pontiac Grand Prix. Maybe you just need a couple of Differentials. Either way, Advance Auto Parts has 209 different Differentials in our inventory ranging from $2.49 to $1,566.99. That means you can find the exact parts or products you need to keep that 1978 Pontiac Grand Prix running smoothly.

Differentials are only as good as their brand. We stock 12 different brands to make sure you have plenty of trusted parts to choose from for your 1978 Pontiac Grand Prix. Valvoline, Yukon Gear, and FELPRO 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 Pontiac Grand Prix, but don’t take our word for it – read our customer ratings and reviews and buy with confidence. Out of the 772 reviews in this category, some of the top rated parts include Differential Shaft Lock Bolt with 4.0 stars and Shaft Repair Sleeve with 5.0 stars.

So if you’re in the market for aftermarket Differentials to keep your 1978 Pontiac Grand Prix 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 Pontiac Grand Prix Last

Simple repair, complete replacement, or a full rebuild. No matter the job, your 1978 Pontiac Grand Prix 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 Grand Prix the best it can be. Be sure to browse some of our top Differentials brands and parts.

Popular Felpro Differentials

We carry Felpro parts in our stock across Rear Differential Cover Gaskets categories, plus more. For a 1978 Pontiac Grand Prix, our most popular Felpro Differentials include:

from $7.99

(45)

DIFFERENTIAL GASKET

Rear Differential Cover Gaskets

FAQs for 1978 Pontiac Grand Prix Differentials

What are the most purchased Differentials for the 1978 Pontiac Grand Prix?

Out of 209 Differentials for the 1978 Pontiac Grand Prix, the most popular in our inventory are:

from $14.49

(2)

DEXRON – VI ATF Full Synthetic Automatic Transmission Fluid, 1 Quart

Differential Oil

from $35.99

(17)

DEX/MERC Automatic Transmission Fluid, 1 Gallon

Differential Oil

from $57.99

This product is not rated

3 Qt – 80W90 Conventional Gear Oil With Posi Additive

Differential Oil

What are the top-rated 1978 Pontiac Grand Prix Differentials?

Top-rated Differentials for your 1978 Pontiac Grand Prix based on customer reviews/ratings are:

from $5.99

(11)

Differential Shaft Lock Bolt

“great”

from $43.99

(2)

Shaft Repair Sleeve

“As a mechanic I dont have time or money to waste on inferior products, which this is not. Great product,great price”

from $25.49

(1)

Bearings

“This Is The One That Fit My 1971 CHEVY TRUCK 12 BOLT PINION REAR BACK BEARING”

1978 Pontiac Grand Prix Differentials

More 1978 Pontiac Grand Prix Differentials

Essential 1978 Pontiac Grand Prix Differentials

Pro-King – Differential Cover Gasket (Part No.742G303A)

Yukon Gear – The Carrier Bearing Puller (Part No.56034)

Richmond Gear – Differential Cross Shaft (Part No.CSPGM75)

National – Bearings (Part No.M86610)

Yukon Gear – Minor Install Kit For GM 8.2" Differential For Buick, Oldsmobile, Pontiac (Part No.12054)

Mr. Gasket – Differential Cover Kit (Part No.9894)

Motive Gear – Pinion Seal (Part No.8610)

USA Standard Gear – Standard Spider Gear Set For GM 7.5", 26 Spline (Part No.39023)

Yukon Gear – 8.5" & 8.6" GM Standard Open Pinion Gear Thrust Washer – Also Fits 8.5" Eaton With 0.795" Cross Pin (Part No.33385)

National – Bearings (Part No.25520)

Yukon Gear – Standard Open Spider Gear Kit For 8.5" GM With 28 Spline Axles (Part No.16054)

National – Shaft Repair Sleeve (Part No.99152)

Yukon Gear – High Performance Ring & Pinion Gear Set For GM 8.2" (Buick, Oldsmobile, And Pontiac) In 3.36 (Part No.24503)

Yukon Gear – Pinion Depth Shim Kit For Toyota8", GM 7.5", 8.2" & 12 Bolt Truck (Part No.55064)

Yukon Gear – Dura Grip Positraction For GM 7.625" With 28 Spline Axles, 3.23 & Up (Part No.26018)

Dorman – Help – Pinion Crush Sleeves (Part No.81058)

Yukon Gear – Cast Yoke For GM 8.5" With A 1350 U/Joint Size (Part No.41092)

Pro-King – Differential Cross Shaft (Part No.742G930)

USA Standard Gear – Spartan Locker For GM 8.5" With 28 Spline Axles, Includes Heavy-Duty Cross Pin Shaft (Part No.17040)

Dorman – Premium Ring And Pinion Master Bearing And Installation Kit (Part No.797-102)

Yukon Gear – Pinion Nut Washer (Part No.33167)

Yukon Gear – Standard Open Side Gear Thrust Washer For 8.5" GM (Part No.33304)

Yukon Gear – 18 Plate Steel Clutches For GM 8.2", GM 8.5", 12T, 12P, Ford 8.8" & Cast Iron ‘Vette (Part No.16110)

Yukon Gear – Pinion Install Kit For ’81 And Older GM 7.5" Differential (Part No.13063)

Yukon Gear – Dura Grip Positraction For GM 7.5" & 7.625" With 26 Spline Axles, 3.23 & Up (Part No.26017)

Yukon Gear – Standard Open Carrier Case, GM 7.625", 3.23 & Up (Part No.20102)

Motive Gear – Differential Gear Install Kit (Part No.GM12IKC)

Yukon Gear – 8.5" & 8.2" GM Carrier Installation Kit (Part No.57008)

Popular 1978 Pontiac Grand Prix Differentials Categories