2015-26 Mustang Ford Performance Loaded 3.55 Differential Housing by Ford Performance

Price: 1189.99 USD
Availability: InStock

2015-26 Mustang Ford Performance Loaded 3.55 Differential Housing

S550 & S650 Mustang Rear Differential Swap | 3.15 to 3.55

Install a new Ford Performance M-4001-88355 loaded differential housing into your 2015-2026 Ford Mustang for optimal performance!

Item #M400188355
MPN# M-4001-88355

Everyday Low Price: $1,189.99

In Stock

This item is not returnable. Details

This item is not eligible for discounts or coupon codes.

Truck Freight Item - Shipping calculated at checkout. Details

Add to Cart

× close

Images

LMR showroom & will call pickup service will be closed beginning Monday 9/21/26 for renovations until further notice. Need help? Contact Us.

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
1996-Present Speedometer Correction

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

Ford Mustang - 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025, 2026

Fitment Notice

Fits 2015-26 Mustang w/ Automatic Transmission
Fits 2018-26 Mustang w/ Manual Transmission
Fits 2015-17 Mustang w/ Manual Transmission Requires 113mm Pinion Flange
If your Mustang is tuned, LMR recommends reaching out to your tuner about the need for a tune recalibration/update. This may vary by tuner.
Requires 4-ounces of friction modifier with initial fill.

S550 & S650 Mustang Rear Differential Swap | 3.15 to 3.55

Check out our YouTube channel for even more tech tips, installation videos, how-tos, and more. The best place to go for anything Mustang related!

California Residents:

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

Ship Weight: 43 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!