Quick Change Rear End L/M Rocket XR1 4.12

The Winters Quick Change Rear End L/M Rocket XR1 4.12 is a complete rear axle assembly engineered for late-model rocket racing and high-performance drag applications. Built with a 10-inch ring gear, 4.12 gear ratio, and wide 5 bolt pattern, this unit delivers the quick-change convenience and precision engineering that serious bracket racers and professional teams demand on the competition circuit.

The assembly features an aluminum center housing, 69.625-inch overall width with centered configuration, and is purpose-built for Rocket late-model vehicles. The 4.12 ratio provides aggressive acceleration off the line while maintaining controlled trap speeds typical of bracket racing classes. The wide 5 bolt pattern ensures compatibility with standard rocket chassis components, and the quick-change design allows rapid gear swaps without full axle removal—critical for teams making mid-event adjustments or testing multiple ratios at test-and-tune events. The aluminum center reduces unsprung weight compared to iron alternatives, contributing to improved handling balance and launch characteristics.

This rear axle assembly suits dedicated bracket racers, street-legal rocket competitors, and racers evaluating different gear ratios for class-specific track conditions. The combination of quick-change functionality, proven aluminum center construction, and the 4.12 ratio option positions it as a solution for drivers who need repeatable, adjustable performance without extensive downtime between rounds.

Winters is recognized in oval-track and drag racing for rear axle assembly engineering and quick-change system design. This XR1 configuration brings that racing-focused reliability and modularity to late-model competitors serious about consistent performance across varying track conditions.