SKU: FRDM4209-88355A
UPC: 756122000663
MPN: M-4209-88355A
The Ford 3.55 Ring & Pinion Set 8.8 IRS for 2015-16 Mustang is a direct-fit differential upgrade designed for drivers looking to enhance acceleration and improve highway cruising characteristics. This assembly replaces the factory gearset, making it essential for owners upgrading their independent rear suspension with a numerically higher ratio for performance or towing applications.
The 8.8-inch Independent Rear Suspension (IRS) housing found in S550-generation Mustangs benefits significantly from precision gear selection. The 3.55 ratio strikes a balance between daily driving usability and responsiveness off the line. This kit includes a standard 34-spline pinion shaft, delivering the mechanical advantage necessary for torque multiplication at the rear wheels while maintaining acceptable engine RPM at highway speeds.
This ring and pinion set is ideal for those who want to enhance their Mustang's performance without compromising drivability. It is engineered to meet Ford OEM specifications, ensuring proper mesh geometry, backlash, and load distribution for durability and NVH (noise, vibration, harshness) control throughout the vehicle's life. Owners of the 2015–2016 Ford Mustang will find this upgrade beneficial for both performance and everyday driving.
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