Ford 9in Ring and Pinion Lightened 620 Ratio

The PEM Ford 9-inch Ring and Pinion Lightened 6.20 Ratio is a precision differential gear set engineered for high-performance Ford 9-inch rear axles requiring aggressive low-end gearing. This lightened ring and pinion kit reduces rotational mass while maintaining the 6.20:1 ratio, making it ideal for vehicles that demand quick acceleration, improved throttle response, and enhanced traction control during hard launches and sustained acceleration runs.

The 6.20 ratio delivers approximately 6.20 wheel rotations for every engine rotation, optimizing power delivery in applications where maximum mechanical advantage is needed during off-the-line performance. The 28-spline interface ensures robust torque transfer and compatibility with high-performance driveshafts and axle shafts. By using lightened construction, PEM reduces unsprung weight in the rear end, which improves suspension articulation, reduces rotational inertia, and enhances overall chassis dynamics—critical factors in drag racing, bracket racing, and performance street applications where quick gear engagement and weight savings compound performance gains.

This ring and pinion set is purpose-built for Ford 9-inch equipped vehicles—muscle cars, street rods, track cars, and performance trucks—where owners seek maximum acceleration without the weight penalty of standard components. The 6.20 ratio is commonly paired with highway-appropriate engine builds or short-track competition setups where lower gearing complements engine power. Installation requires proper setup procedures including pinion depth adjustment, backlash measurement, and bearing preload tuning to ensure quiet, efficient operation and longevity under load.