Loaded differential housing for Mustang IRS
Fits 2018-2022 Mustang
Fits 2015-2017 Mustang (see technical notes below)
Iron housing with aluminum cover
Includes 3.55:1 ratio gear set M-4209-88355A and Traction-Lok differential M-4204-M
Custom calibration required for speedometer and shift corrections
Original Equipment on 2019 Mustang GT
Note-on 2015-2017 Mustang, pinion flange change may be necessary; comes with pinion flange with 93mm bolt circle and 110mm driveshaft pilot installed. For applications that require 95mm bolt circle and 113mm driveshaft pilot, use FR3Z-4851-B pinion flange, available through Ford dealer

Ford Racing 2015 - 2022 Ford Mustang Super 8.8in IRS Loaded Differential Housing 3.55

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