Ford Racing 2019 Ford Mustang Super 8.8in IRS Loaded Differential Housing 3.55

If you're looking to upgrade the rear differential on your 2015-2025 Ford Mustang, this Super 8.8-inch IRS Loaded Differential Housing from Ford Racing is a solid choice. This unit comes pre-loaded with a 3.55 ratio gear set and a Traction-Lok differential, making it a comprehensive solution for enhancing your Mustang's drivetrain performance. It's designed to handle increased power and torque, offering a noticeable improvement in acceleration and power delivery.

The housing itself is constructed from durable iron for strength, topped with a lightweight aluminum cover. This combination balances robust construction with reduced unsprung weight. Inside, you'll find the M-4209-88355A 3.55 ratio gear set and the M-4204-MI Traction-Lok differential already installed. The pinion flange is also pre-installed, featuring a 93mm bolt circle and a 110mm driveshaft pilot, simplifying the installation process. This loaded housing is a significant upgrade over the stock unit, especially if you're planning on adding more power to your Mustang.

Keep in mind that after installing this differential housing, custom calibration will be required for your speedometer and shift points to ensure everything functions correctly. This is a common step when upgrading drivetrain components, and it ensures your car's systems read accurately. This unit is a direct fit for the 2015 through 2025 Ford Mustang IRS models.