Mustang IRS Super 8.8-Inch Ring and Pinion Set - 3.73 Ratio

SKU: M-4209-88373A

In stock


  • Fits 2015-2022 Mustang Super 8.8-inch IRS center section
  • Includes OEM crush sleeve and pinion nut  
  • Requires M-4210-B3 Mustang 8.8-inch ring gear and pinion install kit 
  • Made in the United States in Ford's Sterling Axle Plant
  • OEM Quality - our superior surface finish, hardening and manufacturing consistency provide the strongest and quietest gears in the market.
  • Requires aftermarket calibration if the vehicle is not originally equipped with this gear ratio
  • Note: 3.15 ratio differential is not compatible with 3.31, 3.55, 3.73 and 4.09 ratio gears. Use differential M-4204-MT or M-4204-M 


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