Super 8.8" IRS Loaded Differential Housing 3.55 (RT4)

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Sale price$1,375.00


  • Fits Backdraft RT4
  • Loaded differential housing
  • 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 2020 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

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