Ford Racing M-4000-488B M220 Rear Axle Assembly 4.88 Ratio with Electronic Locking Differential

The Ford Racing M-4000-488B is a complete M220 rear axle assembly designed specifically for 2021-2025 Ford Bronco models. This heavy-duty bolt-in replacement axle features a 4.88 gear ratio and factory electronic locking differential, providing exceptional off-road capability and traction control for serious trail enthusiasts.

Key Features:

• Complete bolt-in rear axle housing assembly for seamless installation
• 4.88:1 final drive ratio for improved low-end torque and crawling capability
• Factory electronic locking differential (E-Locker) for maximum traction
• Axle shafts and brake rotors included in complete assembly
• Utilizes production brake components for easy maintenance
• 220mm (8.66-inch) ring gear diameter for enhanced strength
• Proudly manufactured in the United States

Important Installation Requirements: Front and rear axle ratios must match. Requires Ford Performance calibration tool (M-9603-B23 for 2.3L engines or M-9603-B27 for 2.7L engines) for speedometer recalibration. Broncos not factory-equipped with E-Locker require wiring/switch kit M-14489-BR (sold separately). Not compatible with Bronco Raptor models.

Competition Use Warning: This part is designed for off-highway and competition use only. Installation on vehicles driven on public roads may violate emissions regulations.