2015-2023 Ford 3.31 Gear Kit
- Replaces Stock Gears
- Improves Acceleration
- Complete Installation Kit
- 3.31 Gear Ratio
- Steel Ring & Pinion
- Bearings & Shims
What's in the Box
- (1) 3.31 Pinion Gear
- (1) 3.31 Ring Gear
- (2) Crush Sleeve
- (2) Pinion Nut
- (1) Pinion Bearings
- (1) Pinion & Carrier Shims Set
- (1) Pinion Seal
- (1) Ring Gear Bolts Set
- (1) Carrier Bearings Set
- (1) Gear Marking Compound
- (1) Bottle of Ford Racing Friction Modifier
- (2) Bottles of Royal Purple 75W140 gear oil
Improve your S550 Mustang's acceleration and throttle response with a set of Ford 3.31 gears. Featuring heavy-duty steel ring and pinion gears, upgraded bearings and shims, and all of the necessary installation components, this gear kit includes everything needed to complete the job. While these Ford gears do not increase horsepower, they will definitely allow your Mustang to launch harder and quicker! Ford Racing Friction Modifier
This friction modifier is a specially formulated additive to provide smooth operation of clutch-type limited-slip differentials. 1 bottle of friction modifier is required when changing the gear oil in rear ends equipped with Ford traction-lock units.
- Although the Royal Purple gear oil has a friction modifier mixed in, it is still recommended that you use the bottle of Ford Racing friction modifier to supply your Super 8.8" IRS rear end with the proper amount of modifier.
- LMR recommends the 75W140 viscosity for all 2015+ 8.8" differentials as it is appropriate for most climates, fuel economy, and performance.
- 3.15 ratio differential is not compatible with 3.31, 3.55, 3.73, and 4.09 ratio gears. Use differential M-4240-M.
- Fits 2015-2023 Mustang w/ Super 8.8" IRS Rear End
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