9in. Small Pinion Brng. Assembly

The Mark Williams 9in. Small Pinion Bearing Assembly (MPN 57670) is a precision pinion support component engineered for high-performance Ford 9-inch differential applications. This aluminum housing features angular contact bearings with pre-installed race geometry and a 28-spline configuration, delivering the structural integrity and load distribution required in heavy-duty drivetrain environments where pinion deflection and wear directly impact power transfer efficiency and vehicle longevity.

Built from aluminum and finished in hard anodized gold coating, this assembly provides excellent corrosion resistance while maintaining lightweight construction critical for performance and off-road applications. The angular contact bearing design preloads the pinion shaft to eliminate play and maintain consistent gear mesh geometry under dynamic loads. The 28-spline interface ensures proper engagement with Ford 9-inch pinion configurations, while the pre-installed race eliminates field alignment variables and reduces assembly time during differential rebuild or upgrade work.

This component serves serious Ford 9-inch differential builders and restorers—whether upgrading factory assemblies for street performance, preparing vehicles for towing and payload capacity, or rebuilding after bearing wear. Racers and off-road enthusiasts rely on quality pinion support to maintain gear alignment during aggressive acceleration, deceleration, and cornering where deflection can degrade efficiency and accelerate component failure. This assembly is sold individually and ships at 7.5 pounds.