GM 12 Bolt Bearing Kit

The MOTIVE GEAR GM 12 Bolt Bearing Kit (part number R12CRMK) is a complete differential installation master kit engineered for 1965–1972 GM 12-bolt rear axles with 8.875-inch carrier housings. This comprehensive bearing kit consolidates all critical components required for professional-grade differential assembly and rebuilding, eliminating the need to source individual seals, gaskets, and hardware from multiple suppliers.

The kit includes precision bearings, crush sleeve, gaskets, seals, shims, thread locker, and fasteners—everything necessary to restore or upgrade differential function with proper preload and alignment. Shims enable precise carrier bearing adjustment, while the crush sleeve maintains correct preload under load cycles. The included thread locker prevents fastener loosening during high-stress operation. MOTIVE GEAR's component selection meets OEM specifications while supporting both street and moderate performance applications on classic Chevrolet platforms.

This kit addresses the needs of restoration shops, classic car builders, and serious enthusiasts performing differential service on first and second-generation Chevrolet trucks and performance vehicles. Proper differential bearing installation is critical to noise control, longevity, and handling stability; this master kit supplies all consumables in verified quantities and quality, reducing installation errors and callback service. The 6.11-pound kit arrives ready for assembly with no additional component sourcing required.

GM 12-bolt differentials remain the gold standard for mid-weight performance platforms. Using a complete factory-spec bearing kit ensures proper function, reduced backlash, and extended service life compared to partial or substandard component combinations.