Ford 9in Bearing Kit 31 Spline

The Ford 9in Bearing Kit 31 Spline by Motive Gear is a complete master differential installation kit engineered for Ford 9-inch rear axle assemblies. This comprehensive bearing kit supplies everything required for proper differential setup and maintenance, including precision bearings, crush sleeve, gaskets, hardware, seals, shims, and thread locker. Technicians and enthusiasts restoring or upgrading Ford 9-inch differentials rely on this kit to ensure correct bearing preload, axle alignment, and long-term reliability in street, strip, or off-road applications.

The 31-spline configuration is designed specifically for Ford 9-inch carrier assemblies with a 2.891-inch ID case, matching OEM and popular aftermarket differential carriers. The kit contains factory-specification bearings that support the carrier and maintain critical side bearing preload—essential for minimizing backlash, reducing noise, and distributing loads evenly across ring and pinion teeth. The included crush sleeve prevents over-tightening of the pinion nut, while precision shims allow technicians to dial in proper ring and pinion mesh geometry. Gaskets and seals ensure a leak-free assembly, and the thread locker protects fasteners from vibration-induced loosening during demanding use.

This bearing kit is ideal for hot rodders, restoration shops, performance builders, and serious DIY mechanics performing full differential rebuilds or carrier replacements on classic and modern Ford-powered vehicles. Installation requires proper tools, a bearing press, and familiarity with differential assembly procedures; professional installation is recommended for those unfamiliar with carrier work. The kit's 5.09-pound weight reflects its complete component set, and compatibility with Ford 9-inch differentials spanning decades of automotive history makes it an indispensable reference standard for any serious axle work.