2015-2023 Mustang Ford Performance 3.55 Rear End Gear & Install Kit by Ford Performance

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Details   |   Reviews
2015-2023 Mustang Ford Performance 3.55 Rear End Gear & Install Kit

Improve off-the-line performance in your 2015-2023 S550 Mustang with this Ford Performance 3.55 rear-end gear and install kit!

Item #LRS-4209355A-K

Everyday Low Price: $424.99

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Made in the USA


  • Replaces Damaged Or Whining Gears
  • Complete Kit Eliminates Guesswork
  • Improved Acceleration
  • Improved Launch


  • All New Bearings & Shims
  • Heavy Duty Construction
  • Royal Purple Diff Fluid
  • Steel Ring & Pinion

 What's in the Box

  • (1) 3.55 Pinion Gear
  • (1) 3.55 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

2015-2023 Mustang Ford Performance 3.55 Rear End Gear & Install Kit

This Ford Performance 3.55 rear-end gear kit is perfect for getting faster acceleration in your 2015-2023 Mustang! Your factory gears are built to maximize fuel mileage, which leaves much to be desired in the performance department. A gear change can provide a night and day difference when it comes to launching your S550 at the track. While these Ford gears do not increase horsepower, they will definitely allow your Mustang to launch harder and quicker! Ford Performance 8.8" Mustang gears are the choice of championship road racing and drag racing teams around the globe. These IRS rear end gears fit the Ecoboost, V6, and GT models with 8.8" rear ends. This kit includes Ford Performance 3.55 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. Allow your S550 Mustang to accelerate quicker than ever with this 3.55 rear-end gear kit is an excellent choice to get!

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.

Royal Purple Max-Gear Oil

Royal Purple Max-Gear gear oil is an ultra-tough automotive gear oil. It is designed to maximize power and provide unsurpassed protection to heavily loaded gears. It makes gears run smoother, quieter, cooler, and longer without overhauls. Max-Gear outperforms other gear oils because it combines the highest quality synthetic oils with Royal Purple’s proprietary Synslide additive technology.

Installation Note

  • 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.
  • The 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

Ford Performance Racing Parts "Packs" and Component Parts Limited Warranty - Click Here
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  • Ford Mustang - 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023

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About This Brand

Ford Performance
Ford Performance - Mustang Ford Racing Parts
Ford Performance Parts is the leader in performance parts and accessories for Mustang and Ford Lightning. is proud to offer Ford Racing Performance Parts for your project. Ford Racing is dedicated to manufacturing the highest quality products offered in the industry. Choose from suspension, exhaust, wheels, and other performance parts at Late Model Restoration. If you want the best for your Mustang or SVT Lightning, look no further than Ford Performance Parts!
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