4.09 Ratio Super 8.8 IRS Differential Ring & Pinion Set
for Ford Mustang 2015-23 & 2024+

Manufactured by Ford Performance | #M-4209-88409A

Features:

• Fits all Super 8.8" IRS axles in 2015-23 & 2024+ Mustangs
• Note: does not fit earlier 1986-2014 8.8” axles
• Includes OEM crush sleeve and pinion nut
• Made in United States in Ford's Sterling axle plant
• OEM Quality - Superior surface finish, hardening and manufacturing consistency provide the strongest and quietest gears in the market.
• Requires aftermarket calibration if vehicle is not originally equipped with this gear ratio
• Note: 3.15 ratio differential not compatible with 3.31, 3.55, 3.73 and 4.09 ratio gears. Use differential M-4204-MT or M-4204-M

Vehicle applications:

• Ford Mustang S550 - 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023
• Ford Mustang S650 - 2024+