1991 Pontiac Firebird Differentials

Keep Your 1991 Pontiac Firebird in Top Shape with Quality Differentials

Whether you’re repairing or upgrading your Differential, using high-quality parts is key to keeping your 1991 Pontiac Firebird looking sharp and performing at its best. At Advance Auto Parts we carry a wide selection of dependable options, including Differential Pinion Seals, Rear Differential Cover Gaskets, and Differential Oil. 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 $7.79 with an average 4.3 star rating. Motive Gear and Dorman offer similar pricing and quality, backed by strong customer feedback. With over 1,404 reviews and a solid 4 star average, you can shop with confidence knowing other Pontiac Firebird owners approve.

Competitive Prices and Extensive Inventory

The average price for a 1991 Pontiac Firebird Differential at Advance Auto Parts is around $338.72, with a range that starts at $2.79 and goes up to $2,219.99. With 181 options in stock from 14 trusted brands, finding the right fit is easy. Popular picks like DEXRON – VI ATF Full Synthetic Automatic Transmission Fluid, 1 Quart, DEX/MERC ATF Conventional Automatic Transmission Fluid, 1 Quart, and Differential Shaft Lock Bolt start at just $6.79 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 Pontiac Firebird in peak condition, inside and out.

Looking for the perfect Differential for your 1991 Pontiac Firebird? 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 Pontiac Firebird. Whether you’re driving a 1991 model or another popular model year like 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, and 2002, 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 Pontiac Firebird Differentials

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$278.99

Polished aluminum cover for 12P GM.

Product Features:

Fits GM 12 bolt passenger car
Finned polished aluminum

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$153.99

Product Features:

Positraction spring kit
Fits GM 7.5″ and 7.625″ Dura Grip
Includes preload plates

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$48.99

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. (includes Supershims)

Product Features:

Fits GM 8.5″ rear
Included are a pinion seal, crush sleeve , complete shim kit, marking compound and brush.

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$386.99

GM 12P DURA GRIP case, bare, 3.08-3.90, 30spline & 33spline.

Product Features:

Dura Grip positraction carrier case
Does not include spider gears
Fits GM 12 bolt passenger car
3.08 – 3.90 ratios only

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$319.99

USA Standard ring & pinion sets are the right choice to add confidence to your install. USA Standard Gear offers a full line of ring & pinion sets for a variety of common & hard to find applications. USA standard gear offers a standard one year warranty against defects on their ring & pinion sets.

Product Features:

Fits GM 7.5″ and 7.6″
7.50″ ring gear diameter
27 spline pinion
10 ring gear bolts
4.11 ratio
Thick gear for 3.23 and down carrier

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$20.99

Mr. Gasket Axle Housing/Differential Cover or Rear End Gaskets are manufactured from a .047 inch thick cellulose/nitrile composite gasket material for excellent sealing and durability. They are precision die-cut for an excellent fit. Fits 1964-1970 Chevrolet 8.2 inch 10 bolt & 1970-1981 GM 8.5 inch ring gear

Product Features:

.047″ thick cellulose/nitrile composite gasket material
Precision die cut
Reusable

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$25.99

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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$601.99

Yukon spider gear set for GM 8.2″ Buick, Olds, Pontiac Dura Grip posi, 28 spline. This kit does not include clutches. This kit fits Yukon Dura Grip ONLY.

Product Features:

Spider gear kit
Fits 8.2″ Buick, Oldsmobile and Pontiac with Dura Grip positraction
Includes two side gears, four pinion gears, cross pin shaft, roll pin and spider gear thrust washers.

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$151.99

MiniSpool

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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

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$271.99

Yukon 1541H alloy rear axle for ’98-’02 GM 7.5″ and 7.625″ Camaro with electronic track control, with a length of 32 inches and 28 splines. Yukon 1541H alloy axles offer a strength increase over stock while retaining a low cost. Yukon 1541H alloy rear axles come with a one year warranty against manufacturing defects. This is a C-clip axle.

Product Features:

Fits 1998-2002 Camaro
28 spline
32″ long
Compatible with traction control applications only
Does not include ABS tone ring

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$41.99

Royal Purple Motor Oil is a specially formulated multi viscocity oil for use in gasoline and diesel engines of all types from cars and trucks to SUVs, motorcycles and boats. Royal Purple(R) Motor Oil with Synerlec(R) additive technology reduces friction, which results in a 1-3 percent increase in horsepower, lowers operating temperatures, provides superior corrosion protection, improves fuel economy, reduces emissions and extends oil life. A.P.I. Certified.

Product Features:

Better wear protection
Increased fuel efficiency
Better protection of the expensive catalytic emission system
Improved compatibility with fuels containing ethanol
Superior corrosion protection
Meets ILSAC GF-5 and Dexos1 performance requirements

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$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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$12.99

Product Features:

KIT SHIM

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$4.99

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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$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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$13.99

Product Features:

Carrier shim kit for Dana Spicer 60, 70, 70HD, 70U and 80

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$11.99

Pinion nut for GM 12 bolt car & truck, 55-62 car & truck, 8.2″, 8.2″ Buick/Olds/Pontiac & 63-79 Corvette. 1 1/8″ socket, 7/8″ x 16 thread.

Product Features:

Pinion nut for GM 12 bolt car and truck, 8.2″, 8.2″ Buick, Oldsmobile and Pontiac and 1963-1979 Corvette
7/8″ x 16 thread
1 1/8″ socket

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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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$5.99

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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$10.99

Product Features:

Clutch guide
Fits GM 7.5″ and 7.625″ Dura Grip

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$6.99

Ring gear bolt for GM 7.5″, 7.6″, 7.6″ IRS, 8.0″, 8.25″ IFS, 8.5″, 8.6″ & 8.6″ IRS. 7/16″ x 20.

Product Features:

Ring gear bolt for GM 7.5″, 7.625″, 7.6″ IRS, 8.0″, 8.25″ IFS, 8.5″, 8.6″ and 8.6″ IRS
7/16″ x 20

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$155.99

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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$119.99

HM89249 set-up bearing (one bearing). No return.

Product Features:

Set up bearing
Fits HM89249 pinion bearing
Easily slips on and off pinion journal to allow for pinion depth adjustment

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$215.99

Bearing race driver. No return.

Product Features:

Bearing race driver
Fits HM88610 race
All steel construction

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$19.79

Our wheel seals are engineered using only the highest-quality materials to meet vehicle manufacturer specificatons. We work with suppliers to design seals that meet FAG’s quality standards. Seals are designed to protect wheel end components from contamination – such as dirt, dust, and moisture – and prevent the loss of grease over the life of the bearing. The specifications for wheel seals are very demanding, and the type required depends on the specific application, position and vehicle class.

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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$59.99

Product Features:

Super carrier shim kit for Ford 8.8″, GM 12 bolt passenger car and truck, GM 8.0″, 8.6″, 8.6″ IRS and 1963-1979 Corvette
Interlocking design makes installation much easier

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$59.99

Product Features:

Super carrier shim kit for Ford 7.5″, GM 7.5″, 7.625″, 7.6″ IFS, 7.6″ IRS, 7.75″, 8.2″, 8.2″ Buick, Oldsmobile and Pontiac and GM 8.5″ front and rear
Interlocking design makes installation much easier

Popular 1991 Pontiac Firebird Differentials Categories

Differential Oil

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 Mini Spools

Differential Ring and Pinions

Differential Lock Assemblies

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 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 Pinion Gear Thrust Washers

Differential Ring and Pinion Kits

Differential Spider and Pinion Gear Kits

Differential Clutch Pack Clips

Most Popular Differential Pinion Seals for 1991 Pontiac Firebirds

Enhance your 1991 Pontiac Firebird with one of the 4 Differential Pinion Seals we have in stock, starting at just $4.99.

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$4.99

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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$9.99

7.2″ GM 7.5″ GM & 8.2″ GM pinion seal.Yukon Mighty seal.

Product Features:

Pinion seal
Fits GM 7.2″ IFS, 1999 and down GM 7.5″ and 7.625″ and GM 8.2″
2.660″ O.D.

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$22.99

7.75″ pinion seal.Yukon Mighty seal.

Product Features:

Pinion seal
Fits GM 7.75″

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$9.99

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:

Design type: spring loaded; multi-lip
Temperature range: -20 Deg. F to 300 Deg. F / -29 Deg. C to 49 Deg. C
Resistance to EP lubricants
Low swell in hydrocarbon fluids
Delivers quality and reliable performance for every type of repair

Best-Selling 1991 Pontiac Firebird Rear Differential Cover Gaskets

Upgrade your Firebird with one of our 2 best-selling Rear Differential Cover Gaskets, earning an average 5 stars rating across 45 reviews.

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$8.99

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
Engineered for the sealing repair environment
Validated for fit, form and function
Unsurpassed quality you can trust

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$11.99

7.5 GM cover gasket.

Product Features:

Cover gasket
Fits GM 7.5″ and 7.625″

Top-Quality Differential Oil for 1991 Pontiac Firebirds

Choose a high-quality OEM or aftermarket Differential Oil for Pontiac Firebirds and enjoy top-notch performance from $11.99.

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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

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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$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

Top Picks for 1991 Pontiac Firebird Differential Covers

Invest in one of our 6 durable Differential Covers for your 1991 Pontiac, knowing you’re getting trusted brands and expert craftsmanship.

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$24.99

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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$29.99

DIFF COVER KIT

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$379.99

Product Features:

Fits GM 7.5″ and 7.625″
Aluminum girdle cover

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$67.99

Product Features:

Fits GM 7.5″ and 7.625″
Steel

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$67.99

Chrome cover for 7.5″ GM.

Product Features:

Fits GM 7.5″ and 7.625″
Chrome

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$29.99

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.

Top-Rated Differential Bearings for 1991 Pontiac Firebirds

Make a smart move for your 1991 Pontiac Firebird with products all priced from $4.49 to $24.29.

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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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$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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$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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$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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$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-Rated Differential Brands For Your 1991 Pontiac Firebird

When it comes to finding the perfect Differential for your 1991 Pontiac Firebird, Advance Auto Parts has you covered with a wide selection of high-quality OEM and aftermarket options from 14 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 Pontiac Firebird, providing peace of mind with parts that meet or exceed OEM standards.

Popular National 1991 Pontiac Firebird Differentials

If you’re looking for a top-quality Differential for your 1991 Pontiac Firebird, 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 $7.79 and an average cost of $56.36, you’ll find the perfect Differential for your needs and budget. National Differentials for the 1991 Pontiac Firebird come highly rated, with over 10 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 $9.29

(2)

Bearing Race

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

from $151.99

(2)

Axle Differential Bearing & Seal Kit

“All you need to overhaul a diff, at a good price”

from $7.79

(6)

Bearing Race

“perfect fit”

Top-Quality Dorman 1991 Pontiac Firebird Differentials

For those in search of a high-quality Differential for their 1991 Pontiac Firebird, Advance Auto Parts offers a great selection of Dorman Differentials. With 2 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 $15.89, giving you a range of options to suit your budget. Backed by over 49 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 $24.99

(38)

Differential Cover

“Looks great, face lift for the rear differential. Old one was rusted & in bad shape. Just remember to get the correct size.”

from $6.79

(11)

Differential Shaft Lock Bolt

“Exactly like OEM”

FAQs for 1991 Pontiac Firebird Differentials

What are the best-selling Differentials for 1991 Pontiac Firebirds?

Out of 181 Differentials that fit 1991 Pontiac Firebirds, the following parts are the top sellers:

DEXRON – VI ATF Full Synthetic Automatic Transmission Fluid, 1 Quart (12079201) – $14.49
DEX/MERC ATF Conventional Automatic Transmission Fluid, 1 Quart (12079139) – $11.99
Differential Shaft Lock Bolt (5707714) – $6.79

What’s the price range for 1991 Pontiac Firebird Differentials?

The prices of Differentials for the 1991 Pontiac Firebird range from $2.79 up to $2,219.99 for the most premium parts.

What is the average price of a Differential for a 1991 Pontiac Firebird?

The average price for Differentials for the 1991 Pontiac Firebird is $338.72. 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 Pontiac Firebird model years?

Yes, we carry Differentials for 34 model years of Pontiac Firebirds between 1967 and 2002. The following model years are the most popular for Differential purchases: 2002, 2001, 2000, 1999, 1998, 1997, 1996, 1995, and 1994.

What are the cheapest Differentials for my 1991 Pontiac Firebird?

The cheapest 1991 Pontiac Firebird Differentials we carry are:

Crush Sleeve (10715252) – $2.79
Ring Gear Bolt (20520168) – $2.99
Differential Cross Shaft (10282201) – $2.99
Crush Sleeve (10592883) – $2.99
Differential Ring Gear Bolt (10282159) – $2.99

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

Yes. We stock Differentials for 6 other popular 1991 Pontiac models. Some of the most popular are 1991 Grand Prix Differentials, 1991 Bonneville Differentials, 1991 Grand Am Differentials, 1991 LeMans Differentials, and 1991 Sunbird Differentials.

What types of Differentials do you sell for my 1991 Pontiac Firebird?

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

Can I get help with 1991 Pontiac Firebird Differential orders?

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

What is your return policy for Pontiac Firebird Differentials?

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

1991 Pontiac Firebird Differentials

Yukon Gear – Polished Aluminum Cover For GM 12 Bolt Car (Part No.32101)

Yukon Gear – Posi Spring Kit For GM 7.5", With Preload Plates (Part No.33206)

Yukon Gear – Minor Install Kit For GM 8.5" Rear Differential (Part No.12055)

Yukon Gear – Dura Grip Case, GM 12 Bolt Car, 3 Series (Part No.20104)

USA Standard Gear – Ring & Pinion "Thick" Gear Set For GM 7.5" In A 4.11 Ratio (Part No.36200)

Mr. Gasket – Differential Gasket (Part No.84B)

Richmond Gear – Differential Cross Shaft (Part No.CSPGM82)

Yukon Gear – Spider Gear Set For GM 8.2" Buick, Olds, Pontiac Dura Grip Posi, 28 Spline (Part No.16144)

Richmond Gear – MiniSpool (Part No.78-1230-1)

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

Yukon Gear – 1541H Alloy Rear Axle For ’98-’02 GM 7.5" And 7.625" Camaro With Electronic Track Control (Part No.21624)

Royal Purple – High Performance 5W-30 Synthetic Engine Oil, Better Wear Protection, 5 Quart (Part No.51530)

Yukon Gear – Positraction Internals For 8.5" GM With 28 Spline Axles (Part No.16052)

Motive Gear – Differential Pinion Shim Kit (Part No.1104)

Pro-King – Differential Pinion Yoke Washer (Part No.742A215)

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

Yukon Gear – Replacement Carrier Shim Kit For Dana 60, 70, 70HD, 70U & 80 (Part No.55011)

Yukon Gear – Pinion Nut (Part No.33150)

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

Dorman – Help – Pinion Crush Sleeves (Part No.81057)

Yukon Gear – Clutch Guide For GM 7.5" & 7.6" Dura Grip (Part No.33251)

Yukon Gear – Ring Gear Bolt (Part No.33049)

Pro-King – Differential Internal Nest Kit (Part No.741A717A)

Yukon Gear – Set Up Bearing (Part No.56043)

Yukon Gear – Bearing Race Driver (Part No.56015)

FAG US – Shaft Seal (Part No.SS2776)

Yukon Gear – Super Carrier Shim Kit For Ford 8.8", GM 12 Bolt Car & Truck, 8.6 & Vette (Part No.55002)

Yukon Gear – Super Carrier Shim Kit For Ford 7.5", GM 7.5", 8.2" & 8.5" (Part No.55001)

Motive Gear – Pinion Seal (Part No.8610)

Yukon Gear – 7.2" GM 7.5" GM & 8.2" GM Pinion Seal (Part No.30192)

Yukon Gear – 7.75" Pinion Seal (Part No.30269)

National – Multi-Purpose Seal (Part No.224255)

Felpro – Axle Housing Cover Gasket Irregular Shaped 10 Bolt Hole Gasket (Part No.RDS 55072)

Yukon Gear – 7.5 GM Cover Gasket (Part No.23018)

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)

Dorman – Differential Cover (Part No.697-701)

ATP – DIFF COVER KIT (Part No.111102)

Yukon Gear – Aluminum Girdle Cover For GM 7.5" & 7.625" (Part No.32118)

Yukon Gear – Steel Cover For GM 7.5" & 7.625" (Part No.32331)

Yukon Gear – Chrome Cover For 7.5" GM (Part No.32014)

Pro-King – Differential Carrier Cover (Part No.741A758)

National – Bearing Race (Part No.LM501314)

National – Bearing Race (Part No.LM102910)

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

National – Bearing Race (Part No.LM67010)

FAG US – Cone (Part No.KM86649)

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

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

FAG US – Cup (Part No.LM67010)