Components for GM 10 bolt and 12 bolt rears are available. The Chevy 12 bolt rear has been a race proven design that has been utilized by GM vehicles since the mid-sixties and is still used in performance vehicles today. There is a wide selection of gear ratios available from U.S. Gear and Motive Gear. All installation kits feature high quality Timken bearings and premium hardware. Other components available include pinion yokes, differentials, covers and billet aluminum caps.