2015-2024 Mustang Ford Performance Loaded 3.55 Differential Housing by Ford Performance

2015-2024 Mustang Ford Performance Loaded 3.55 Differential Housing

Install a new Ford Performance M-4001-88355 loaded differential housing into your 2015-2024 Ford Mustang for optimal performance!

Item #M400188355
MPN# M-4001-88355

Everyday Low Price: $1,189.99

Low Stock Only 3 available. Ships tomorrow!
This item is not eligible for discounts or coupon codes.
 This item is returnable. Details
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  • Ford Mustang - 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023
Fitment Notice
  • Fits 2015-2024 Mustang w/ Automatic Transmissions with 110mm IRS pinion flange.
  • Fits 2018-2024 Mustang w/ Manual Transmissions with 110mm IRS pinion flange.
  • Custom calibration required for speedometer and shift corrections is require if your stock gears are not 3.55.
  • Requires 4-ounces of friction modifier with initial fill.
  • Iron housing is great upgrade for automatic Mustang w/ aluminum differential housing.
  • 2015-2017 Mustang with MT82 will require a 113mm manual IRS pinion flange.
Made in the USA


  • Pre-installed Gears
  • 100% New Parts
  • Increased Acceleration


  • Ford Racing 3.55 Performance Gears Set
  • Ford Racing Differential
  • Iron Housing
  • Aluminum Differential Cover

 What's in the Box

  • (1) Loaded IRS Housing

Mustang Loaded 3.55 Differential Housing
If you're looking to replace the rear gears in your Mustang or repair a broken housing, the Ford Performance loaded differential housing will get you up and running in no time. The loaded housing features M-4209-88355A Mustang IRS super 8.8" ring/pinion set and M-4204-M traction-lok differential. The gears are pre-installed, set, and ready to roll with no additional difficult gear install needed. Installing this loaded housing is an easy way to make your 3.15 or 3.31 geared Mustang accelerate quicker.

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

Ford Performance Racing Parts "Packs" and Component Parts Limited Warranty - Click Here
Ford Performance Racing Parts - NO WARRANTY - Click Here
Ford Performance Racing Parts Crate Engine Limited Warranty - Click Here

California Residents:
Prop 65 Warning SignWARNING: Cancer and Reproductive Harm-
Ship Weight: 48 lbs

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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