3.42 8.5in 10 Bolt GM

The Richmond 3.42 8.5in 10 Bolt GM ring and pinion kit is designed for GM truck and Blazer owners looking to optimize their vehicle's gearing without needing a full axle swap. This kit is particularly suitable for those upgrading classic C10 or K5 Blazer models, as well as modern Silverado platforms, providing a balanced gear ratio for both highway cruising and off-road responsiveness.

Manufactured with precision and high-quality materials, Richmond's ring and pinion sets are engineered to withstand the torque loads typical in truck applications. The 3.42 gear ratio is lower than stock options like 3.73 or 4.10, which helps reduce engine RPM at highway speeds, enhancing fuel economy and drivetrain longevity while still offering sufficient low-end power for towing and payload.

This kit is compatible with GM C10 and K5 Trucks & Blazers from 1967 to 1987, making it a versatile choice for various builds. While installation can be done with basic mechanical skills, using a dial indicator and pinion depth gauge is recommended for optimal setup, ensuring proper mesh contact and backlash for improved performance.