1991 GMC C1500 Differentials

Keep Your 1991 GMC C1500 in Top Shape with Quality Differentials

Whether you’re repairing or upgrading your Differential, using high-quality parts is key to keeping your 1991 GMC C1500 looking sharp and performing at its best. At Advance Auto Parts we carry a wide selection of dependable options, including Rear Differential Cover Gaskets, Differential Oil, and Differential Bearings. Whether you’re replacing a damaged part or enhancing your truck’s style and protection, you’ll find exactly what you need to get the job done right.

Top-Rated Differentials from Trusted Brands

Looking for a reliable Differential? We’ve got you covered with options from brands you know and trust like National, Motive Gear, and Dorman. For example, National Differentials start at just $7.99 with an average 4.3 star rating. Motive Gear and Dorman offer similar pricing and quality, backed by strong customer feedback. With over 5,836 reviews and a solid 4 star average, you can shop with confidence knowing other GMC C1500 owners approve.

Competitive Prices and Extensive Inventory

The average price for a 1991 GMC C1500 Differential at Advance Auto Parts is around $321.97, with a range that starts at $2.59 and goes up to $2,304.99. With 276 options in stock from 17 trusted brands, finding the right fit is easy. Popular picks like DEXRON – VI ATF Full Synthetic Automatic Transmission Fluid, 1 Quart, Axle Housing Cover Gasket Oval Shaped 10 Bolt Hole Gasket, and DEX/MERC ATF Conventional Automatic Transmission Fluid, 1 Quart start at just $10.99 and offer a great balance of form and function.

Explore Related Parts

While you’re upgrading or replacing your Differential, don’t forget to check out other key components like Drive Shafts and Axles and Universal Joints. At Advance Auto Parts, we’re here to help you keep your 1991 GMC C1500 in peak condition, inside and out.

Looking for the perfect Differential for your 1991 GMC C1500? You’re in the right place. Below, you’ll find links to various types of Differentials that fit your vehicle. At Advance Auto Parts, we offer only the highest quality OEM and aftermarket Differentials, ensuring durability and a precise fit for your GMC C1500. Whether you’re driving a 1991 model or another popular model year like 1990, 1992, 1993, 1994, 1995, 1996, 1997, 1998, and 1999, we’ve got you covered. Purchasing Differentials from Advance Auto Parts is a smart choice, giving you access to trusted brands and parts built to perform. Below, you’ll find links to various types of Differentials that fit your vehicle.

Essential 1991 GMC C1500 Differentials

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$1884.99

Remanufactured Rear Axle assemblies are completely disassembled, thoroughly cleaned and reassembled using new wear parts. Units are assembled, sealed & include backing plates, axle shafts & fluid.

Product Features:

Rear axles are assembled with backing plates & axle shafts, and filled with fluid prior to shipping
Axles are fully painted & shipped securely in environmentally safe and recyclable containers that are the perfect size for returning your original core
Our complete Rear axle assemblies mean you just hang brakes, connect suspension & go! Your installation will be simple and trouble free
Remember to match axle ratio to original. For 4WD rear axle must match front axle ratio

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$2.99

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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$41.99

Product Features:

CONSISTENT PERFORMANCE: Matched cup and cone components ensure consistent performance
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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$191.99

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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$2.99

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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$52.99

DIFF COVER KIT

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$404.99

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
14 piece kit
Carbon fiber clutches

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$139.99

Worn or damaged differential end yoke causing driveline vibrations? This direct replacement end yoke matches the original equipment part for a trustworthy repair and reliable performance.

Product Features:

Direct replacement – this differential end yoke matches the fit and construction of the original yoke
Excellent value – this replacement end yoke offers original equipment quality at a fraction of the price of dealer parts
Quality materials – this end yoke is machined from cast iron for strength and is precision machined for reliability
Validated fit – this differential end yoke has been tested to confirm accurate fit

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$49.99

Standard open cross pin (0.795″ diameter) for 8.5″ GM. fits some Eaton positractions.

Product Features:

Cross pin shaft for GM 8.5″ and 8.6″
Fits standard open differentials only
0.795″ diameter

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$6.99

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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$153.99

HM89449 set-up bearing (one bearing). No return.

Product Features:

Set up bearing
Fits HM89449 pinion bearing
Easily slips on and off pinion journal to allow for pinion depth adjustment

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$148.99

Yukon Carrier installation kits are great, low cost kit for carrier changes such as Positraction or locker upgrades. Carrier installation kit for GM 8.5″ differential with HD bearings for large journal carrier. This kit contains carrier bearings, races and shims. This kit is used in 8.5″ differentials using a Yukon Dura Grip, Eaton posi, ValueTrac, True Trac, Pro-Series Auburn, Detroit Locker or standard carrier with large bearing journals.

Product Features:

Fits GM 8.5″ with aftermarket positraction
Works with Heavy Duty Bearings
Includes carrier bearings and races and “super” carrier shim kit

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$207.99

Yukon standard open spider gear kit for 8.5″ GM with 30 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 30 spline axles
Includes two side gears, two pinion gears, cross pin shaft, cross pin bolt and spider gear thrust washers.

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$165.99

10 bolt Mini Spool for 8.5″ GM with 28 spline axles. Mini spools are a low-cost traction option for vehicles looking for full-time lockup. The mini spool installs into a standard open carrier and give 100% power to both tires at all times. These units are not recommended for street-driven vehicles. We recommend full spools for vehicles with large tires or high horsepower. These units come with a one year warranty against manufacturing defects.

Product Features:

Fits GM 8.5″ with 28 spline axles
Installs into a standard open carrier case
Provides 100% traction to both wheels at all times
Not recommended for street driven vehicles

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$323.99

Direct replacement – this differential end yoke matches the fit and construction of the original yoke
Excellent value – this replacement end yoke offers original equipment quality at a fraction of the price of dealer parts
Quality materials – this end yoke is machined from cast iron for strength and is precision machined for reliability
Validated fit – this differential end yoke has been tested to confirm accurate fit

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$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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$7.99

Differential Cover B

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$5.99

Product Features:

CRUSH SLV 8 7/8 12BLT TRK

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$29.99

9.5″ GM differential carrier Supershim kit.

Product Features:

Super carrier shim kit for GM 9.5″
Interlocking design makes installation much easier

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$8.99

Positraction clutch guide.

Product Features:

Clutch guide for Chrysler 9.25″, Dana Spicer 44, Dana Spicer 50, Ford 8.8″, GM 12 bolt passenger car, GM 8.2″, 8.5″ and 8.6″, 1963-1979 Corvette and Nissan Titan
Compatible with Dura Grip positractions only

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$11.99

Valvoline DEX/MERC ATF is a high-quality transmission fluid formulated to meet the challenging demands of many automatic transmissions. Its responsive low-temperature fluidity is beneficial in both electronic and hydraulic controlled transmissions and transaxles. Recommended for use in the following applications: MERCON*, DEXRON*-III, Ford M2C138-CJ and M2C166-H, Allison C-4 and TES-389, and Caterpillar TO-2.

Product Features:

Formulated with premium base stocks and advanced additive technology to meet the challenging demands of automatic transmissions
Enhanced anti-shudder protection for smooth shifting and maximum power transfer
Developed with anti-wear technology to help improve transmission durability
Engineered with a proprietary blend of base oils and advanced additives to provide better oil flow at low temperatures and greater film protection at higher temperatures

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$16.99

Product Features:

CONSISTENT PERFORMANCE: Matched cup and cone components ensure consistent performance
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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$10.79

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

Product Features:

PREMIUM MATERIALS – Precision manufactured using premium-grade steel for outstanding durability and performance
SMOOTH ROTATION – Crowned raceways 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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$46.99

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

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$883.99

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 one ton applications including 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

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$544.99

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!The Powertrax® Lock-Right Locker provides outstanding traction for off-road machines and race vehicles. Powertrax No-Slip Traction Systems deliver excellent performance to street-driven cars and trucks.

Powertrax® lockers range from the original, Lock-Right for serious straight-line performance, to the No-Slip traction system for street-able vehicles.

Powertrax® offers three levels of GRIP locking differentials, ranging from the clutch-type GRIP LS with a forged steel case, the gear-driven GRIP PRO and finally the GRIP LOK for extreme traction.

Powertrax® = Extreme Traction Systems!

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$455.99

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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$1153.99

The Yukon Grizzly Locker is the ultimate in locking differentials for street, off-road, & drag racing. Grizzly Lockers provide 100% power to both tires, while still allowing for disengagement while negotiating turns. The Yukon Grizzly locker is a mechanical locking differential. It features 8620 internals for maximum strength. It’s patented design reduces common locker failures. All units assembled in the USA! All Grizzly Lockers are backed by the best warranty in the business! Yukon covers the replacement unit and covers any collaterally damaged parts and associated labor, up to $2,000!

Product Features:

Fits GM 8.5″ and 8.6″ with 30 spline axles
2.73 and up ratio only
Patented internal design reduces common locker failures
8620 internals for added strength
Assembled in the USA

Popular 1991 GMC C1500 Differentials Categories

Differential Oil

Differential Pinion Yokes

Pinion Shaft Bearings

Rear Differential Cover Gaskets

Differential Open Unit and Components

Differential Covers

Differential Pinion Shaft Lock Bolts

Differential Bearings

Differential Axle Shafts

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 Cover Plugs

Differential Clutch Packs

Differential Ring and Pinions

Differential End Yokes

Differential Pinion Supports

Differential Lock Assemblies

Rear Differential Pinion Bearings

Differential Spools

Differential Carrier Bearings

Rear Housing Cover Gaskets

Differential Pinion Bearing Kits

Complete Differentials

Differential Ring Gear Bolts

Bearing Race Drivers

Differential Carrier Bearing Shims

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 Ring and Pinion Kits

Limited Slip Differential Assemblies

Differential Spider and Pinion Gear Kits

Differential Clutch Pack Clips

Axle Differential Bearing and Race Set

Most Popular Rear Differential Cover Gaskets for 1991 GMC C1500s

Enhance your 1991 GMC C1500 with one of the 3 Rear Differential Cover Gaskets we have in stock, starting at just $10.99.

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$13.99

9.5″ GM cover gasket.

Product Features:

Cover gasket
Fits GM 9.5″

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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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$10.99

8.2″ & 8.5″ rear cover gasket.

Product Features:

Cover gasket
Fits GM 8.2″, 8.5″ and 8.6″

Best-Selling 1991 GMC C1500 Differential Oil

Upgrade your C1500 with one of our 7 best-selling Differential Oil, earning an average 5 stars rating across 450 reviews.

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$19.99

Mobil 1 Synthetic Gear Lubricant LS 75W-90 is a supreme, multi-purpose automotive gear lubricant that helps to provide exceptional thermal stability and resistance to high temperature oxidation, extending gear life due to minimal deposits. Helps to deliver outstanding protection against low speed/high torque wear with the capability to handle severe driving conditions while delivering smooth efficient performance. Mobil 1 Synthetic Gear Lubricant LS provides exceptional shear stability, corrosion protection, and enhanced frictional properties. Compared to conventional hypoid gear lubricants, Mobil 1 LS 75W-90 performs exceptionally over a wide range of temperatures to reduce wear at start up. Mobil 1 gear lube helps to minimize leakage and reduce contamination while providing good resistance to foaming to maintain film strength for reliable lubrication. Meets or exceeds the requirements of the following industry specifications: API GL-5.

Product Features:

Mobil 1 LS synthetic automotive gear lubricant exceeds the highest level of performance requirements of modern passenger vehicles
Helps to provide exceptional thermal stability and resistance to high temperature oxidation and extend gear life due to minimal deposits
Delivers outstanding protection against low speed/high torque wear, handling severe driving conditions with smooth, efficient performance
Compared to conventional hypoid gear lubricants, performs exceptionally over a wide range of temperatures to reduce wear at start up
Provides exceptional shear stability, corrosion protection, and enhanced frictional properties
Manufacturer Part Number: 104361

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$14.49

Valvoline DEXRON-VI/MERCON LV ATF is a full-synthetic transmission fluid formulated with advanced additive technology to meet and exceed the requirements of the General Motors DEXRON-VI specification. It is officially licensed and approved by GM and is fully back-serviceable and can be used wherever DEXRON-II and/or DEXRON-III are recommended. Recommended for use in the following applications: DEXRON-VI, DEXRON-III, DEXRON-II, and Allison C-4.

Product Features:

Formulated with full-synthetic base stocks and advanced additive technology to meet the challenging demands of automatic transmissions
Enhanced anti-shudder protection for smooth shifting and maximum power transfer
Developed with anti-wear technology to help improve transmission durability
Engineered with a proprietary blend of base oils and advanced additives to provide better oil flow at low temperatures and greater film protection at higher temperatures

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$11.99

Formulated with premium base stocks and advanced additive technology to meet the challenging demands of automatic transmissions
Enhanced anti-shudder protection for smooth shifting and maximum power transfer
Developed with anti-wear technology to help improve transmission durability
Engineered with a proprietary blend of base oils and advanced additives to provide better oil flow at low temperatures and greater film protection at higher temperatures

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$148.99

Redline Synthetic “Shock Proof” Oil with positraction Additive. 4 Quarts.

Product Features:

Includes four quarts of Redline Shockproof oil and one 4oz bottle of Yukon positraction additive

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$99.99

Redline Synthetic “Shock Proof” Oil. 3 Quarts.

Product Features:

Includes three quarts of Redline Shockproof oil

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$137.99

Redline Synthetic “Shock Proof” Oil. 4 Quarts.

Product Features:

Includes four quarts of Redline Shockproof oil

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$10.29

Formulated to meet the specific requirements of Subaru vehicles equipped with conventional (non-CVT) transmissions up to model year 2005. Recommended for service-fill in all Subaru automatic transmissions where SUBARU ATF HP is specified. Fuel economy demands and more sophisticated electronic controls have made automatic transmissions not only more complex, but also unique to each vehicle manufacturer. Long gone are the days of having just a couple choices of automatic transmission fluid type. Idemitsu is the factory fill Automatic Transmission Fluid (ATF) supplier to most Asian imports. Idemitsu application-specific ATF products match the exact friction materials and performance requirements of each different vehicle model for which they are made.

Product Features:

Excellent resistance to oxidation and thermal breakdown provide long fluid life and extended protection
Precisely engineered frictional characteristics guarantee smooth shifting and outstanding anti-shudder performance
Excellent resistance to oxidation and thermal breakdown provide long fluid life and extended protection
Excellent seal compatibility and conditioning reduces risk of fluid leaks due to seal shrinkage, hardening and cracking
Advanced anti-wear technology provides maximum protection to gears and bearings
Precisely engineered frictional characteristics guarantee smooth shifting and outstanding anti-shudder performance
Provides superior cleanliness, maintaining the transmission free of sludge and varnish deposits
Excellent seal compatibility and conditioning reduces risk of fluid leaks due to seal shrinkage, hardening and cracking
Advanced anti-wear technology provides maximum protection to gears and bearings

Top-Quality Differential Bearings for 1991 GMC C1500s

Choose a high-quality OEM or aftermarket Differential Bearing for GMC C1500s and enjoy top-notch performance from $4.49.

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$9.29

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

Product Features:

PREMIUM MATERIALS – Precision manufactured using premium-grade steel for outstanding durability and performance
SMOOTH ROTATION – Crowned raceways 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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$26.99

Value-priced bearing meets all cataloged application requirements.

Product Features:

Brand may vary by location

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$7.79

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

Product Features:

PREMIUM MATERIALS – Precision manufactured using premium-grade steel for outstanding durability and performance
SMOOTH ROTATION – Crowned raceways 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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$19.99

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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$4.49

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

Product Features:

PREMIUM MATERIALS — Precision manufactured using premium-grade steel for outstanding durability and performance
SMOOTH ROTATION — Crowned raceways 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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$8.49

Product Features:

PREMIUM MATERIALS: Precision manufactured using premium-grade steel for outstanding durability and performance
SMOOTH ROTATION: Crowned raceways 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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$38.99

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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$24.29

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.

Product Features:

High-precision and High-quality components used in all KITs
Coverage of classic and new high-tech solutions for the best system coverage

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$23.99

Product Features:

Cross pin bolt
Fits GM 9.5″ and 9.25″ IFS

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$21.29

High-precision and High-quality components used in all KITs
Coverage of classic and new high-tech solutions for the best system coverage

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$11.29

High-precision and High-quality components used in all KITs
Coverage of classic and new high-tech solutions for the best system coverage

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$6.99

Cross pin bolt for Chrysler 8.25″, 9.25″ rear, Ford 7.5″, 8.8″, GM 12 bolt car & truck, 7.2″ IFs, 7.5″, 7.6″, 8.0″, 8.25″ IFS & 8.5″.

Product Features:

Cross pin bolt for Chrysler 8.25″ and 9.25″ rear, Ford 7.5″ and 8.8″, GM 12 botl car and truck, 8.5″, 8.25″ IFS, 8.0″, 7.625″, 7.5″ and 7.2″ IFS

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$6.69

High-precision and High-quality components used in all KITs
Coverage of classic and new high-tech solutions for the best system coverage

Top Picks for 1991 GMC C1500 Differential Covers

Invest in one of our 8 durable Differential Covers for your 1991 GMC, knowing you’re getting trusted brands and expert craftsmanship.

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$63.99

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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$37.99

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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$74.99

Chrome cover for 8.6″, 8.5″ and 8.2″ GM rear.

Product Features:

Fits GM 8.2″, 8.5″ and 8.6″
Chrome

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$93.99

Steel cover for GM 9.5″ Threaded for fill plug, fill plug not included.

Product Features:

Fits GM 9.5″
Steel

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$255.99

Polished aluminum cover for 8.6″, 8.2″ and 8.5″ GM rear.

Product Features:

Fits GM 8.5″ and 8.6″
Finned polished aluminum

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$123.99

Product Features:

Fits GM 8.2″, 8.5″ and 8.6″
Steel

from

$72.99

Product Features:

Fits GM 9.5″
Chrome

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$35.99

DIFF COVER KIT

Top-Rated Rear Housing Cover Gaskets for 1991 GMC C1500s

Make a smart move for your 1991 GMC C1500 with products all priced from $8.99 to $10.99.

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$10.99

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.

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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$8.99

Meets or exceeds all original equipment specifications
Application specific design to ensure a perfect fit
Engineered for the sealing repair environment
Validated for fit, form and function
Unsurpassed quality you can trust

Top-Rated Differential Brands For Your 1991 GMC C1500

When it comes to finding the perfect Differential for your 1991 GMC C1500, Advance Auto Parts has you covered with a wide selection of high-quality OEM and aftermarket options from 17 trusted brands. We carry the most popular Differential brands including National, Dorman, and Motive Gear, and more, all known for their exceptional customer ratings (average brand rating of 4.3 stars) and competitive prices, as low as $6.79. Purchasing a Differential from us here at Advance Auto Parts is a smart move for both you and your 1991 GMC C1500, providing peace of mind with parts that meet or exceed OEM standards.

Popular National 1991 GMC C1500 Differentials

If you’re looking for a top-quality Differential for your 1991 GMC C1500, Advance Auto Parts has exactly what you need with our selection of National Differentials. We have 3 National Differentials in stock for this fitment, all known for their durability and precision fit. With prices starting at just $7.99 and an average cost of $18.42, you’ll find the perfect Differential for your needs and budget. National Differentials for the 1991 GMC C1500 come highly rated, with over 7 customer reviews and an impressive average rating of 4.3 stars. Choosing a National Differential from Advance Auto Parts is a smart move to ensure quality and value for your vehicle.

from $7.99

(4)

Bearing Race

“Goes with M88010 bearing cup. Application was the pinion bearing race for a Ford 9 Inch on a 1957 Ford F-100.”

from $9.29

(2)

Bearing Race

“Reasonable price and woks well. front diff 2006 Escalade esv”

from $37.99

(1)

Shaft Repair Sleeve

“Very delicate piece, but came shipped quite safely and not damaged. High quality.”

Top-Quality Dorman 1991 GMC C1500 Differentials

For those in search of a high-quality Differential for their 1991 GMC C1500, Advance Auto Parts offers a great selection of Dorman Differentials. With 3 Dorman Differentials in stock, you can trust you’re getting top-tier parts designed for durability and a perfect fit. Prices for these Differentials start at just $6.79, with an average price of $70.26, giving you a range of options to suit your budget. Backed by over 32 customer ratings and an average rating of 4.2 stars, Dorman Differentials provide both reliability and excellent performance. Choosing a Dorman Differential from Advance Auto Parts is a smart investment in your vehicle’s performance and longevity.

from $139.99

(10)

Differential Yoke including Seal and Pinion Nut

“Will this fot 2001 jeep grand cherokee 4.0 limited with dana 35 read end”

from $6.79

(11)

Differential Shaft Lock Bolt

“Exactly like OEM”

from $63.99

(11)

Differential Cover

“Good quality cover, nice coat of paint on it. Should outlast the truck.”

FAQs for 1991 GMC C1500 Differentials

What are the best-selling Differentials for 1991 GMC C1500s?

Out of 276 Differentials that fit 1991 GMC C1500s, the following parts are the top sellers:

DEXRON – VI ATF Full Synthetic Automatic Transmission Fluid, 1 Quart (12079201) – $14.49
Axle Housing Cover Gasket Oval Shaped 10 Bolt Hole Gasket (5185823) – $10.99
DEX/MERC ATF Conventional Automatic Transmission Fluid, 1 Quart (12079139) – $11.99

What’s the price range for 1991 GMC C1500 Differentials?

The prices of Differentials for the 1991 GMC C1500 range from $2.59 up to $2,304.99 for the most premium parts.

What is the average price of a Differential for a 1991 GMC C1500?

The average price for Differentials for the 1991 GMC C1500 is $321.97. Keep in mind the variety of part types within our Differential category, where you are likely to find a wide range of prices across a variety of parts and components.

Does Advance Auto Parts sell Differentials for other GMC C1500 model years?

Yes, we carry Differentials for 18 model years of GMC C1500s between 1979 and 1999. The following model years are the most popular for Differential purchases: 1999, 1998, 1997, 1996, 1995, 1994, 1993, 1992, and 1990.

What are the cheapest Differentials for my 1991 GMC C1500?

The cheapest 1991 GMC C1500 Differentials we carry are:

Differential Pinion Gear Washer (10282533) – $2.59
Ring Gear Bolt (20520168) – $2.99
Differential Crush Sleeve (20520169) – $2.99
Differential Cross Shaft (10282201) – $2.99
Differential Ring Gear Bolt (10282159) – $2.99

Does Advance Auto Parts sell Differentials for any other 1991 GMC models?

Yes. We stock Differentials for 22 other popular 1991 GMC models. Some of the most popular are 1991 Jimmy Differentials, 1991 K2500 Differentials, 1991 C2500 Differentials, 1991 K1500 Differentials, and 1991 Sonoma Differentials.

What are the top-rated Differentials that fit the 1991 GMC C1500?

The one 1991 GMC C1500 Differential we have in stock is the Differential Pinion Gear Washer. It costs $2.59.

What types of Differentials do you sell for my 1991 GMC C1500?

As of 11/2/25, these are some of the most in-demand types of Differentials for a 1991 GMC C1500:

Can I get help with 1991 GMC C1500 Differential orders?

Contact our customer support team by chat or phone, through the help desk page, where you can find instant answers about GMC Differentials and more.

What is your return policy for GMC C1500 Differentials?

Advance Auto Parts keeps returns simple. For new GMC C1500 Differentials and accessories, your online orders can be returned, in their original condition, within 45 days. For requirements, see the returns page.

1991 GMC C1500 Differentials

Spartan – Drive Axle Assembly; GM Posi C1500 RWD Axle (Part No.RAXP1510C)

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

National – Multi-Purpose Bearing (Part No.A-42)

Pro-King – Differential Internal Nest Kit (Part No.742G717B)

Pro-King – Differential Ring Gear Bolt (Part No.742G935)

ATP – DIFF COVER KIT (Part No.111107)

Yukon Gear – 14 Plate Carbon Clutches For GM 8.2", GM 8.5", 12T, 12P, Ford 8.8" & Cast Iron ‘Vette (Part No.16041)

Dorman – Differential Yoke including Seal and Pinion Nut (Part No.697-500)

Yukon Gear – Standard Open Cross Pin (0.795" Diameter) For 8.5" GM – Fits Some Eaton Positractions (Part No.33401)

Pro-King – Differential Cover Plug (Part No.742G484)

Yukon Gear – Set Up Bearing (Part No.56044)

Yukon Gear – Carrier Installation Kit For GM 8.5" Differential With HD Bearings (Part No.57009)

Yukon Gear – Standard Open Spider Gear Kit For 8.5" GM With 30 Spline Axles (Part No.16055)

Yukon Gear – Mini Spool For GM 8.5" With 28 Spline Axles (Part No.32232)

Dorman – Differential Pinion Yoke Assembly (Part No.697-531)

Pro-King – Differential Cross Shaft (Part No.742G673)

Yukon Gear – Differential Cover B (Part No.33572)

Motive Gear – Differential Crush Sleeve (Part No.3954482)

Yukon Gear – Super Carrier Shim Kit For GM 9.5" (Part No.55003)

Yukon Gear – Positraction Clutch Guide (Part No.33352)

Valvoline – DEX/MERC ATF Conventional Automatic Transmission Fluid, 1 Quart (Part No.798153)

National – Multi-Purpose Bearing (Part No.A-5)

National – Bearing Race (Part No.HM89410)

National – Shaft Repair Sleeve (Part No.99170)

Yukon Gear – The Carrier Bearing Puller (Part No.56072)

Powertrax – No-Slip Traction System (Part No.9207853005)

Pro-King – Differential Case (Loaded) (Part No.742G715B)

Yukon Gear – Grizzly Locker For GM 8.5" & 8.6", 30 Spline, 2.73 & Up (Part No.28035)

Yukon Gear – 9.5" GM Cover Gasket (Part No.23023)

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

Yukon Gear – 8.2" & 8.5" Rear Cover Gasket (Part No.23020)

Mobil 1 – 75W-90 Full Synthetic Gear Lubricant, Extends Gear Life, 1 Quart (Part No.26101)

Valvoline – DEXRON – VI ATF Full Synthetic Automatic Transmission Fluid, 1 Quart (Part No.822405)

Valvoline – DEX/MERC ATF Conventional Automatic Transmission Fluid, 1 Quart (Part No.798153)

Yukon Gear – Redline Synthetic "Shock Proof" Oil With Positraction Additive – 4 Quarts (Part No.15005)

Yukon Gear – Redline Synthetic "Shock Proof" Oil – 3 Quarts (Part No.15000)

Yukon Gear – Redline Synthetic "Shock Proof" Oil – 4 Quarts (Part No.15004)

Idemitsu – Type HP Automatic Transmission Fluid , 1 Quart (Part No.10107-042F)

National – Bearing Race (Part No.LM501314)

Driveworks – Tapered Cone/Cup Wheel Bearing Set (Part No.S-A-35)

National – Bearing Race (Part No.LM102910)

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

National – Bearing Race (Part No.LM67010)

National – Bearing Race (Part No.LM501310)

National – Tapered Roller Bearing Cone (Part No.JLM506849A)

FAG US – Cone (Part No.KM86649)

Yukon Gear – Standard Open And Gov-Loc Cross Pin Bolt With M10X1.5 Thread For 9.5" And 9.25" GM IFS (Part No.33342)

FAG US – Bearing – TRB (Tapered Roller Bearing) (Part No.KT5)

FAG US – Cup (Part No.M88010)

Yukon Gear – Cross Pin Bolt (Part No.33067)

FAG US – Cup (Part No.LM67010)

Dorman – Differential Cover (Part No.697-711)

Dorman – Differential Cover (Part No.697-700)

Yukon Gear – Chrome Cover For 8.6", 8.5" And 8.2" GM Rear (Part No.32017)

Yukon Gear – Steel Cover For GM 9.5", Threaded For Fill Plug, Plug Not Included (Part No.32333)

Yukon Gear – Polished Aluminum Cover For 8.6", 8.2" And 8.5" GM Rear (Part No.32030)

Yukon Gear – Steel Cover For GM 8.2" & 8.5" Rear (Part No.32332)

Yukon Gear – Chrome Cover For 9.5" GM (Part No.32018)

ATP – DIFF COVER KIT (Part No.111101)

Felpro – Axle Housing Cover Gasket Oval Shaped 10 Bolt Hole Gasket (Part No.RDS 55028-1)

Felpro – Axle Housing Cover Gasket: Irregular Shaped 14 Bolt Hole Gasket (Part No.RDS 55387)