Ford Racing M-4000-513B 9-Inch Rear Axle Assembly 5.13 Ratio

The Ford Racing M-4000-513B is a complete Ford 9-inch rear axle assembly built for serious performance applications. Featuring a 5.13:1 ring and pinion gear ratio, this axle is engineered to deliver maximum acceleration and low-end torque, making it an ideal choice for drag racing and high-performance street builds.

Key Features:

• Ford 9-inch rear axle assembly — the gold standard in performance rear axles
• 5.13:1 gear ratio optimized for maximum off-the-line acceleration
• Built to Ford Racing quality and performance standards
• Legendary Ford 9-inch design offers exceptional strength and easy gear changes
• Compatible with a wide range of Ford performance and racing builds

The Ford 9-inch rear axle has been a staple of motorsport and performance builds for decades, prized for its durability, interchangeability, and aftermarket support. The M-4000-513B delivers that proven platform with a numerically high 5.13 gear ratio suited for applications where power and acceleration take priority over top speed.