Boost your Mustang's performance with the Super 8.8" IRS Loaded Diff, delivering a 3.55:1 gear ratio and Traction-Lok differential for unmatched handling. Engineered for a precise fit on 2018-2025 models, this OEM part transforms every drive into an exhilarating experience.
 
PLEASE CONTACT US FOR A SHIPPING QUOTE. THIS IS AN OVERSIZED ITEM THAT MUST SHIP FREIGHT. FREIGHT CHARGES WILL APPLY.
 
Loaded differential housing for Mustang IRS
Fits 2018-2026 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.