Ford Racing 15-25 Mustang GT 3.73 Ratio 8.8in Ring and Pinion Set (frpM-4209-88373A)

This is the Ford Racing 15-25 Mustang GT 3.73 Ratio 8.8in Ring and Pinion Set. Part frpM-4209-88373A. Differential parts control how power is split between the driven wheels; limited-slip units and solid diff mounts help put power down out of corners.

Ford Racing ring and pinion sets are engineered, manufactured, and tested for maximum performance. These ring and pinion sets are finished in a black oxide coating for corrosion resistance, and are available in many different ratios to fit a variety of Ford differentials. 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. This part is designed and intended for competition use only. It should not be installed on a vehicle that is driven on public roads and highways. Installation of this art on a vehicle driven on public roads and highways is likely to violate U.S. and Canadian laws and regulations relating to motor vehicle emissions.

Features and benefits

• Incl. OEM Crush Sleeve and Pinion Nut
• Requires M-4210-B3 Install Kit
• OEM Quality Provides The Strongest/Quietest Gears On The Market
• Requires Aftmkt Calib. If Vehicle Not Equipped w/This Gear Ratio
• Made in the USA

Product details

• Part type: Differentials & LSD
• Brand: Ford Racing
• Axle Type: Ford 8.8 in.
• Gear Ratio: 3.73
• Position: Rear
• Ford Racing part number: frpM-4209-88373A

Fitment

• Vehicle: Ford Mustang (S550), Ford Mustang (S650)
• Years and trims on file: 2019-2020 Ford Mustang Bullitt; 2024-2025 Ford Mustang Dark Horse; 2024-2025 Ford Mustang Dark Horse Premium; 2015-2025 Ford Mustang EcoBoost; 2015-2025 Ford Mustang EcoBoost Premium; 2015-2018 Ford Mustang GT; 2018-2025 Ford Mustang GT; 2015 Ford Mustang GT 50 Years Limited Edition; 2015-2018 Ford Mustang GT Premium; 2018-2025 Ford Mustang GT Premium; 2021-2023 Ford Mustang Mach 1; 2015-2020 Ford Mustang Shelby GT350; plus 3 more on file
• Application listing: Ford Racing 15-25 Mustang GT 3.73 Ratio 8.8in Ring and Pinion Set
• Check the vehicle, model years, engine and trim above against your car before ordering. Not sure? Ask us and we will check it against your VIN.

Shipping & returns

• Orders are processed within 1–3 business days; standard delivery is 3–7 business days within the United States.
• Ford Racing parts are supplied through our distributor. We confirm availability and lead time with you after you order.
• We currently ship within the U.S. only. See our Shipping Policy.
• 30-day returns on unused parts in original packaging — see our Return Policy.

Installation at Team ANBD

Team ANBD is a performance shop in Andover, New Jersey. We can align or corner-balance the car, and prep track cars. Book an appointment or ask us about installation and fitment before you order.