2018-2022 MUSTANG IRS LOADED DIFFERENTIAL HOUSING 3.55

M-4001-88355B

• Loaded differential housing for 2018-2022 Mustang
• Fits 2015-2017 Mustang (see technical notes below)
• Original Equipment on 2019 Mustang GT
• 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
• 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.