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Ford Performance IRS Loaded Differential Housing; 3.55 (15-22 Mustang GT, V6)

Item 406490
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      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation


      • Loaded Differential Housing for Independent Rear Suspension
      • Installed With a 3.55:1 Ratio Gear Set
      • Includes a Traction-Lok Differential
      • Solid Cast Iron Housing
      • Sturdy Aluminum Differential Cover
      • Black Oxide Finish
      • Direct Bolt-On Installation
      • Fits All 2015-2022 Ford Mustang GT, V6 Models


      Maximum Differential Performance. Take your Mustang to the next level with the Ford Performance 3.55 IRS Loaded Differential Housing. This fully loaded differential housing features components and a build quality that’s designed for maximum performance. Whether you’re working on a project Mustang for the track, or looking to upgrade your ’15 to ’19 daily driver into a weekend warrior, this differential housing is for you.

      Fully Loaded. The Ford Performance 3.55 IRS Loaded Differential Housing comes pre-installed with an 8.80-inch ring and pinion gear set. This ring and pinion gear has a 3.55:1 gear ratio and is engineered to be both strong and quiet. This diff housing also includes a Traction-Lok differential. This limited-slip differential is designed to distribute torque to each of the rear wheels concurrently for maximum grip.

      Solid Build Quality. The Ford Performance 3.55 IRS Loaded Differential Housing is manufactured from cast nodular iron for extreme durability. Its differential cover is crafted from high-grade aluminum for strength, minus the weight. Finally, this differential housing is finished in a black oxide coating that prevents corrosion, but still permits a custom paint job.

      Direct Bolt-On Installation. The Ford Performance 3.55 IRS Loaded Differential Housing is designed as a direct bolt-on assembly onto your factory differential location. This install will require special tools and advanced mechanical skills, as well as a few hours work. If you aren’t confident with your skills, or if you can’t spare the time, professional installation is recommended.

      Application. The Ford Performance 3.55 IRS Loaded Differential Housing fits all 2015-2022 Ford Mustang GT V6 models.

      Application Notes. Your ECU will require re-calibration when installing this loaded diff housing.a pinion flange kit for it to work. This differential housing fits 34-spline axles.

      Technical Note. For 2015-2017 Mustangs, a pinion flange change may be necessary as this Differential Housing comes with a 93mm Bolt Circle and 110mm Driveshaft Pilot installation. For applications that require a 95mm Bolt Circle and 113mm Driveshaft Pilot, you will need to use Ford Pinion Flange, part# FR3Z-4851-B.



      Ford Performance M-4001-88355B

      CA Residents: WARNING: Cancer and Reproductive Harm -

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) Loaded Differential Housing, 3.55-Gear Ratio

      Customer Reviews (7)

        Brand Image

        Reviews of Ford Performance Drivetrain products have an average rating of 4.8 out of 5

          Questions & Answers

          10 More Questions

          Will It Fit My Mustang

          • GT - 15, 16, 17, 18, 19, 20, 21, 22
          • Mach 1 - 21, 22
          • V6 - 15, 16, 17

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