Planning a gear swap for better towing, acceleration, or fuel economy? This Richmond Gear GM85342 is a complete ring and pinion set designed for GM 10-bolt rear axles with an 8.5-inch ring gear. The gear ratio is 3.42:1. Richmond Gear is a trusted name in performance and replacement gears, known for their quality and strength. This set is ideal for upgrading or repairing the differential in various GM trucks, SUVs, and performance cars that use this specific axle setup. Installation requires specialized tools and knowledge – this is definitely a job for an experienced mechanic or gear specialist. Ensure this ratio and part number are correct for your vehicle's application before purchasing. Get ready to change your ride's character!