1979-1993 Mustang SVE 31 Spline Heavy Duty Rear Axle Kit 4 Lug - 3.73 Gears by SVE Products ®

1979-1993 Mustang SVE 31 Spline Heavy Duty Rear Axle Kit 4 Lug - 3.73 Gears

 When it's time to beef up your 1979-1993 Fox Body Mustang 8.8" rear end, look no further than this 31-Spline Heavy Duty Rear Axle Kit from LMR! SVE has taken out the guesswork in compiling this heavy-duty rear axle kit solution which packs in the performance for severe service, be it on the drag strip or the road course! Featuring core components from brands like SVE, Yukon, Ford Performance, and Royal Purple this kit ensures you have the right parts to keep your Mustang rolling with confidence.

31 Spline 4 Lug Rear Axle Conversion

These Yukon axles are stock length 31 spline with a 4x108 bolt pattern that allows the use of popular 4 lug wheels on your Fox Body Mustang. Yukon builds these axles from high-quality, 1541H forged steel that's hardened to increase torque capacity 25% over your stock axles. A set of 8 new wheel studs are included to make installation quick and easy!

Ford Performance Traction-Lok

Ford Racing Traction-Lok differentials optimize your vehicle's traction by transferring the power to both rear wheels. These limited-slip differential units use heavy plate-style clutches to ensure your engine's full power potential makes it to the ground and limit the "one-wheel wonder"! Perfect for the street or strip!

Motorcraft Friction Modifier

Motorcraft friction modifier is a specialty formulated additive to provide smooth operation of clutch-type, limited-slip differentials. One bottle of friction modifier is required when changing the gear oil in the rear ends equipped with Ford traction-lock units.

Ford Performance 3.73 Gears

These Ford Performance Mustang 3.73 gears are a great way to improve acceleration to make your Mustang faster! The kit features a set of Ford Performance 3.73 gears, a Yukon gear install kit w/ American made Koyo bearings, a bottle of Ford Performance friction modifier, and 2 bottles of Royal Purple 75W90 gear oil. The bearing kit includes a GT500 style pinion bearing, new carrier bearings, pinion seal, ring gear bolts, pinion nut, crush sleeve, shims, and marking compound.

SVE Performance 8.8 Rear Axle Differential Cover

SVE's aluminum differential cover adds strength to your differential by reducing flex in the main bearings. When your differential bearings move this allows the ring and pinion to mesh incorrectly, which in turn, creates unwanted wear and can eventually lead to the infamous gear whine/failure. This heavy-duty differential cover comes with bolts, washers, and installation instructions to ensure proper installation.

Kit Includes:

• FRPP Carbon Clutch Disc 31 spline differential
• Hardened 31 Spline 4 lug axles YA-FM4235B
• High Strength Steel 3" studs MOR-46180
• Ford Racing (FRPP) 3.73 gears M-4209-88373
• Yukon gear install kit w/ American made Koyo bearings
• Ford axle bearing & seal kit LRS-1225AK
• Carrier bearing cap stud kit M-4034-A
• SVE Heavy Duty Differential Cover SVE-4033A
• Pinion flange LRS-4851A
• 75W-140 Royal Purple synthetic gear oil

Product Note

• Requires open-end lug nuts due to the 3" length of the wheel studs.
• PVTKF8.8-B GT500 Pinion Race & Bearings Included As An Upgrade For Factory Component

Application

• Fits 1979-1993 Mustangs with 8.8" Axle

Installation Note

• LMR Recommends the 75W140 viscosity for all 1986-2014 8.8" differentials as it is appropriate for most climates, fuel economy, and performance.

Speedometer Correction
After installation of rear gears, you will need to correct the speedometer. There are different methods to do this depending on year model.

1979-1995 Speedometer Correction - Click Here
1996-Present Speedometer Correction - Click Here

SVE Products Limited Warranty - Click Here