2015-25 Mustang Ford Performance Loaded 3.55 Differential Housing by Ford Performance

Install a new Ford Performance M-4001-88355 loaded differential housing into your 2015-2025 Ford Mustang for optimal performance!

Item #M400188355
MPN# M-4001-88355

Everyday Low Price: $1,189.99

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Ford Mustang - 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025

Fitment Notice

Fits 2015-2025 Mustang w/ Automatic Transmissions with 110mm IRS pinion flange.
Fits 2018-2025 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.

Benefits

Pre-installed Gears
100% New Parts
Increased Acceleration

Features

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:

WARNING: Cancer and Reproductive Harm- www.P65Warnings.ca.gov

Ship Weight: 48 lbs

About This Brand

Ford Performance - Mustang Ford Racing Parts
Ford Performance Parts is the leader in performance parts and accessories for Mustang and Ford Lightning.

LMR.com 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!