- Loaded differential housing for 2015-2021 Mustang IRS
- Fits Mustang GT and V-6 with manual transmission
- Iron housing with aluminum cover
- Includes 3.73:1 ratio gear set M-4209-88373A and Torsen differential M-4204-MT
- Original Equipment on 2015 Mustang GT Performance Pack
- Custom calibration required for speedometer and shift corrections
- Automatic transmission requires Pinion Flange Kit M-4851-M8A