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High Performance Parts for Gear Heads with Passion, Like Us.


Super 8.8″ IRS Differential 3.55 and Knuckle Kit

  • Ask us about the brake kit we recommend to pair with this package!
  • Includes 8.8″ IRS differential (M-4001-88355) and knuckle kit w/toe bearing(M-5970-M)
  • Fits 2015+ Mustang equipped with manual gearbox (GT or V-6)
  • Iron housing with aluminum cover (aluminum housing available for $680)
  • 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
  • Adaptable to automatic transmission (requires automatic IRS pinion flange)
  • Knuckle set limits down time for FR3 suspension kit install
  • Toe Link Bearing Kit pressed in for easy bolt-in installation
  • $1639 total value!
  • Shipping costs more than $15!

Optional Aluminum Housing Upgrade Available for an Additional Cost


2015+ Mustang rear components for use in Factory Five Type 65 Coupe, MK4 Roadster, ’33 Hot Rod Coupe/Pickup/Roadster in a special package! It includes both the 8.8″ IRS differential and the knuckle kit with toe bearing, can be yours for just $1736! Ask about the rear brake kit that goes well with this package!

Weight 140.00 lbs

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