Ring & Pinion Ford 10in 3.89 Pro Gear 35 Spline

The Richmond Ring & Pinion Ford 10-inch 3.89 Pro Gear 35 Spline is a high-performance differential gearset engineered for serious Ford 10-inch rear axle builds where aggressive acceleration and consistent power delivery matter. This gearset is designed for enthusiasts and professional mechanics who demand reliability during high-load driving—whether you're running a modified street machine, weekend warrior, or dedicated performance vehicle.

The 3.89 ratio strikes a balance between highway cruising and off-the-line responsiveness, making it ideal for muscle cars, hot rods, and lifted trucks that need improved low-end torque multiplication without excessive RPM climb at highway speeds. Richmond's Pro Gear line utilizes precision-forged steel construction and advanced heat treatment to handle elevated torque loads while maintaining tight tolerances for smooth, quiet operation. The 35-spline design provides superior load distribution across the ring and pinion teeth, reducing stress concentration and extending component life under aggressive driving or towing applications.

Machined to exact specifications, this gearset minimizes gear lash variation and backlash creep, resulting in reduced driveline clunking and improved power transfer efficiency compared to standard OEM units. The billet-quality materials resist fatigue failure and tooth stripping, critical when paired with modern engine modifications that significantly exceed factory output. Installation in a Ford 10-inch housing is straightforward for those familiar with differential setups.