2015-2023 Ford Performance 3.73 Gear Kit
- Improved Acceleration
- Eliminates Guesswork
- Complete Kit
- 3.73 Ratio
- Heavy Duty Construction
- OEM Replacement Parts
What's in the Box
- (1) 3.73 Pinion Gear
- (1) 3.73 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
This Ford Performance 3.73 rear end gear kit is perfect for getting faster acceleration in your 2015-2023 Mustang! This kit fits S550 IRS rear ends and includes everything you need to swap out or upgrade your stock gears. This kit includes Ford Performance 3.73 rear end gears, bearings, shims, gaskets, seals, gear oil, friction modifier and all of the hardware needed to get them installed. These performance gears do not add horsepower, but will definitely get your Mustang getting off the line faster! 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 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-4204-M.
- Fits 2015-2023 Mustang w/ Super 8.8" IRS Rear End
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