Ford Performance 3.73 Ring & Pinion Set 8.8 IRS 2015-2026 Mustang M-4209-88373A

A 3.73 gear ratio transforms your Mustang's acceleration response and highway cruising efficiency—especially if you've upgraded your engine or suspension. This Ford Performance set delivers the gear mesh quality and durability of OEM manufacturing, ensuring quiet operation under load while maintaining the precision needed for both street and track duty. Whether you're hunting better launch characteristics or optimizing throttle response, this is a direct bolt-in solution for your 8.8-inch IRS.

This gear set includes the OEM crush sleeve and pinion nut, simplifying your installation process. However, proper setup requires the Ford M-4210-B3 ring-gear and pinion install kit, and vehicles not originally equipped with this ratio will need aftermarket ECU calibration to maintain accurate speedometer and transmission shift points.

• Gear Ratio: 3.73:1
• Axle Type: 8.8-inch IRS
• Fitment: 2015-2026 Mustang (Super 8.8 IRS only)
• Material: High-strength steel
• Surface Finish: OEM hardening
• Made in USA: Sterling Axle Plant
• Includes: Crush sleeve, pinion nut
• Requires: M-4210-B3 install kit
• Installation: Professional setup recommended
• Calibration: Necessary for non-original applications