Hurst Engineering Master Overhaul Kits provide you with all the parts needed to properly overhaul your trucks 8.875" 12-Bolt rear axle (GM 12T). Our kits include Timken bearings and high quality seals for a worry free installation. Hurst Engineering kits are the most comprehensive kits available and include carrier bearings, pinion bearings, pinion seal, shim kit, crush sleeve, pinion nut, ring gear bolts, thread locker, gear marking compound, and rear cover gasket. This kits works well to overhaul your worn rear axle or when replacing a carrier or ring gear.