1991 Ford Mustang Differentials

Essential 1991 Ford Mustang Differentials

Yukon Gear – Carrier Installation Kit For Ford 8.8" Differential (Part No.57007)

Carrier Installation Kit For Ford 8.8" Differential

from

$134.99
Yukon Carrier installation kits are great, low cost kit for carrier changes such as Positraction or locker upgrades. Carrier installation kit for Ford 8.8″ differential. This kit contains carrier bearings, races and shims.

Product Features:
  • Fits Ford 8.8″
  • Includes carrier bearings and races and “super” carrier shim kit
See More

Motive Gear – Differential Mini Spool (Part No.MS88-31)

Differential Mini Spool

from

$101.99


Product Features:
  • MINI SPOOL 8.8 FORD 31SPL
See More

Yukon Gear – Dropout Housing Stud For Ford 8" & 9" (Part No.32338)

Dropout Housing Stud For Ford 8" & 9"

from

$7.99
Product Features:
  • Housing stud
  • Fits Ford 8″ and 9″
See More

Richmond Gear – RngPnnInstlKt (Part No.83-1011-B)

RngPnnInstlKt

from

$48.99
RngPnnInstlKt

National – Multi Purpose Seal (Part No.7044NA)

Multi Purpose Seal

from

$15.79
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:
  • Low swell in hydrocarbon fluids
  • Design type: spring loaded; multi-lip
  • Provides good low temperature capability
  • Temperature range: -40°F to 225°F; -40°C to 107°C
  • Delivers quality and reliable performance for every type of repair
See More

Dorman – Differential Pinion Yoke Assembly (Part No.697-527)

Differential Pinion Yoke Assembly

from

$172.99
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
See More

Yukon Gear – Master Overhaul Kit For Ford Daytona 9" LM102910 Differential With Crush Sleeve Eliminator (Part No.14205)

Master Overhaul Kit For Ford Daytona 9" LM102910 Differential With Crush Sleeve Eliminator

from

$364.99
Yukon Master Overhaul kits give you all the high quality parts you need to start & finish every differential job. Yukon offers more tailor-made kits than any other manufacturer in the industry to meet your specific installation needs. This kit uses carrier bearings & races with an I.D. of 1.780″ and an O.D. of 2.891″. This kit uses Timken bearings and races along with high quality seals and small parts. Included in this kit are carrier bearings and races, pinion bearings and races, pilot bearing, pinion seal, complete shim kit, pinion nut, crush sleeve (if applicable), oil baffles and slingers (if applicable), Thread locking compound, and marking compound with brush. Yukon’s Master Overhaul kits are the most comprehensive and complete kits on the market. They do extensive research to ensure that every kit is specially tailored to your application.

Product Features:
  • Fits Ford 9″ with LM102940 carrier race and Daytona pinion support
  • Included are Timken bearings and races, pinion bearings and races, pilot bearing, pinion seal, complete shim kit, ring gear bolts, pinion nut, crush sleeve eliminator , thread locker, marking compound with brush, and gasket.
See More

Yukon Gear – Trac Loc Friction Plate, Single Sided, 4 Tab (Part No.16179)

Trac Loc Friction Plate, Single Sided, 4 Tab

from

$29.99
Product Features:
  • Friction plate
  • Fits Ford 8″ and 9″ Trac Loc
See More

National – Shaft Repair Sleeve (Part No.99199)

Shaft Repair Sleeve

from

$37.99
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
See More

Sealed Power – Engine Auxiliary Shaft Bearing Set (Part No.1881M)

Engine Auxiliary Shaft Bearing Set

from

$36.99
Sealed Power® parts provide innovative designs, use leading edge materials and utilize ISO & QS certified manufacturing in order to deliver top quality products that meet the rigorous demands of today’s modern engines.

Product Features:
  • Steel-backed Babbitt lining material
  • Used in automotive and high-performance
  • Babbitt is designed to perform under extreme loads w/o damaging other engine parts
  • Babbitt is more environmentally friendly than other material
  • ISO & QS certified manufacturing
See More

USA Standard Gear – Master Overhaul Kit for the Ford 9" LM603011 Differential with Solid Spacer (Part No.37037)

Master Overhaul Kit for the Ford 9" LM603011 Differential with Solid Spacer

from

$236.99
USA Standard Master Overhaul kits let you finish your install with confidence. This kit uses Koyo bearings and races. Included are carrier bearings and races, pinion bearings and races, pinion seal, complete shim kit, ring gear bolts, pinion nut, crush sleeve (if applicable), oil baffles and slingers (if applicable), threading locking compound, marking compound with brush and gasket.

Product Features:
  • Fits Ford 9″ with LM603011 carrier races
  • Uses Koyo bearings and races
  • Included are carrier bearings and races, pinion bearings and races, pinion seal, complete shim kit, ring gear bolts, pinion nut, crush sleeve, pilot bearing, thread locker, marking compound with brush and gasket.
See More

Dorman – Differential Clutch Kit (Part No.697-780)

Differential Clutch Kit

from

$262.99
This differential disc kit is a low-cost, time-saving repair solution for the posi-traction function. They are designed to match the fit and performance of the original disc on specific vehicle years, makes and models.

Product Features:
  • Direct replacement – this differential clutch kit provides the necessary components for repairing the original equipment on specific vehicles
  • Quality materials – all components are built for reliable longevity and performance
  • Smart solution – provides original equipment fit and function for a competitive price compared to original manufacturer
  • Trustworthy quality – backed by team of designers and engineers in the United States
See More

Yukon Gear – Lightweight Steel Spool For Ford 9" With 31 Spline Axles (Part No.32046)

Lightweight Steel Spool For Ford 9" With 31 Spline Axles

from

$313.99
Yukon Performance 2-1/8″ deck lightweight steel spool for 9″ Ford with 31 spline axles. Spool uses 1.785″ journal bearings. Yukon performance spools are made from the highest quality materials to ensure high strength and long life in performance applications. Spools provide 100% power to both tires at all times and are a lower cost alternative to lockers. Spools are not recommended for street driven vehicles. Yukon Performance spools come with a one year warranty against manufacturing defects.

Product Features:
  • Fits Ford 9″ with 31 spline axles
  • Lightweight design
  • Provides 100% traction to both wheels at all times
  • Not recommended for street driven vehicles
See More

Pro-King – Differential Ring Gear Bolt (Part No.761A935)

Differential Ring Gear Bolt

from

$0.99
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.
See More

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

Redline Synthetic "Shock Proof" Oil With Positraction Additive - 4 Quarts

from

$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
See More

Pro-King – Differential Bearing Cone (Part No.742G255)

Differential Bearing Cone

from

$19.79
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.
See More

Yukon Gear – Bearing Race Driver (Part No.56023)

Bearing Race Driver

from

$219.99
Bearing race driver. No return.

Product Features:
  • Bearing race driver
  • Fits M88010 race
  • All steel construction
See More

Motive Gear – Differential Pinion Shaft (Part No.B7AZ4211A)

Differential Pinion Shaft

from

$13.59


Product Features:
  • FORD 9″ CROSS PIN
See More

USA Standard Gear – Axle Shaft (Part No.35197)

Axle Shaft

from

$236.99
Axle Shaft

Spartan – Drive Axle Assembly; Ford Mustang 99-04 Axle (Part No.RAX1962A)

Drive Axle Assembly; Ford Mustang 99-04 Axle

from

$1422.99
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
See More

Yukon Gear – Positraction Internals For 8.8" Ford With 31 Spline Axles (Part No.16016)

Positraction Internals For 8.8" Ford With 31 Spline Axles

from

$329.99
Yukon positraction internals for 8.8″ Ford with 31 spline axles. This kit fits Yukon Gura Grip & Eaton positractions. 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.

Product Features:
  • Spider gear kit
  • Fits Ford 8.8″ with Yukon Dura Grip positraction with 31 spline axles
  • Includes two side gears, two pinion gears, cross pin shaft, roll pin and spider gear thrust washers.
See More

B & M – Rear End Cover 1 EA B&M (Part No.40297)

Rear End Cover 1 EA B&M

from

$269.99
B&M Cast Aluminum Differential Covers are designed to strengthen the differential by preventing case distortion and ring gear & bearing cap deflection. Constructed of A356.0-T6 aluminum, these rugged covers significantly increase the fluid capacity and dissipate heat much faster than the stock factory unit to prolong the life of your ring and pinion gears. Additional features include an engraved B&M logo, drain and fill port locations, a magnetic drain plug for catching ferrous metal particles, and complete hardware and installation instructions.

Product Features:
  • Additional Oil Capacity
  • More Cooling Ability
  • No Dipstick Modification
  • Some Include Fluid Pickup Extension
  • Built-In Drain Plugs
  • Cast Aluminum
See More

National – Bearings (Part No.362A)

Bearings

from

$14.49
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
See More

Felpro – Differential Cover Gasket (Part No.RDS 55081)

Differential Cover Gasket

from

$14.99
Fel-Pro gaskets offer 100% vehicle sealing with application-specific materials to give you sealing solutions with the performance and durability professionals trust

Product Features:
  • Meets or exceeds all original equipment specifications
  • Application specific design to ensure a perfect fit
  • Unsurpassed quality you can trust
  • Validated for fit, form and function
  • Each Fel-Pro gasket, no matter how small, is engineered to exacting standards with proprietary design, engineering and manufacturing processes
See More

Yukon Gear – Cover Bolt For Ford 7.5", 8.8" & 9.75" (Part No.33554)

Cover Bolt For Ford 7.5", 8.8" & 9.75"

from

$6.99
Yukon 1541H alloy replacement rear axle for Dana 60, 70, and 80, 35 spline. (40″ to 43.5″) Full float axle (8×3.96″ ). 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 full-floating axle.

Product Features:
  • 35 spline
  • 8 x 3.96″ bolt pattern
  • Cut to length design fits 40″-43.5″ applications
  • Fits Dana Spicer 60, 70 and 80
See More

Yukon Gear – Trac-Loc For Ford 8" Wtih 31 Spline Axles – Street Design (Part No.26004)

Trac-Loc For Ford 8" Wtih 31 Spline Axles - Street Design

from

$819.99
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-Trac Loc uses a nodular case, billet side hat, and forged internals for higher strength than stock Trac-Locs. The units use composite clutches for high performance and long life. All units are Rebuildable. Yukon offers a one year warranty against manufacturing defects.

Product Features:
  • Fits Ford 8″ with 31 spline axles
  • Trac Loc positraction
  • Clutch style positraction
  • Smooth design
  • Internal gears are manufactured using forged 4320 steel and cut to provide stronger teeth
  • Fully rebuildable
  • Assembled in the USA
See More

Yukon Gear – Differential Carrier (Part No.20143)

Differential Carrier

from

$729.99
Differential Carrier

Yukon Gear – Trac Loc For Ford 9" Wtih 31 Spline Axles – Aggressive Design (Part No.26009)

Trac Loc For Ford 9" Wtih 31 Spline Axles - Aggressive Design

from

$784.99
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 Trac Loc uses a nodular case, billet side hat, and forged internals for higher strength than stock Trac-Locs. The units use composite clutches for high performance and long life. All units are Rebuildable. Yukon offers a one year warranty against manufacturing defects.

Product Features:
  • Fits Ford 9″ with 31 spline axles
  • Trac Loc positraction
  • Clutch style positraction
  • Aggressive design
  • Internal gears are manufactured using forged 4320 steel and cut to provide stronger teeth
  • Fully rebuildable
  • Assembled in the USA
See More

1991 Ford Mustang Differentials

Maybe you’re in the middle of a full rebuild of that 1991 Ford Mustang. Maybe you just need a couple of Differentials. Either way, Advance Auto Parts has 234 different Differentials in our inventory ranging from $0.99 to $2,064.99. That means you can find the exact parts or products you need to keep that 1991 Ford Mustang running smoothly.

Differentials are only as good as their brand. We stock 17 different brands to make sure you have plenty of trusted parts to choose from for your 1991 Ford Mustang. Valvoline, Driveworks, 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 1991 Ford Mustang, but don’t take our word for it – read our customer ratings and reviews and buy with confidence. Out of the 2,047 reviews in this category, some of the top rated parts include Differential Shaft Lock Bolt with 4.0 stars and Bearings with 5.0 stars.

So if you’re in the market for aftermarket Differentials to keep your 1991 Ford Mustang 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 1991 Ford Mustang Last

Simple repair, complete replacement, or a full rebuild. No matter the job, your 1991 Ford Mustang 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 Mustang the best it can be. Be sure to browse some of our top Differentials brands and parts.

Popular Powertrax Differentials

We carry Powertrax parts in our stock across Differential Open Unit and Components categories, plus more. For a 1991 Ford Mustang, our most popular Powertrax Differentials include:
Lock Right Locker
from $444.99
(1)
Lock Right Locker
Differential Open Unit and Components

FAQs for 1991 Ford Mustang Differentials

What are the most purchased Differentials for the 1991 Ford Mustang?

Out of 234 Differentials for the 1991 Ford Mustang, the most popular in our inventory are:
Differential Cover Gasket
from $14.99
(121)
Differential Cover Gasket
Rear Housing Cover Gaskets
Taper Bearing Set
from $10.29
(38)
Taper Bearing Set
Differential Bearings
Multi Purpose Seal
from $11.99
(28)
Multi Purpose Seal
Differential Pinion Seals

What are the top-rated 1991 Ford Mustang Differentials?

Top-rated Differentials for your 1991 Ford Mustang based on customer reviews/ratings are:
Differential Shaft Lock Bolt
from $5.99
(11)
Differential Shaft Lock Bolt
“great”
Bearings
from $15.99
(9)
Bearings
“as advertised”
Differential Master Bearing Kit - Timken
from $137.99
(8)
Differential Master Bearing Kit – Timken
“These Timken bearings work great in my 10 second drag car.”