Rear Differential Bearing Kit (ZBKD44HD) by USA Standard Gear. With carrier bearings and races, pinion bearings and races, pinion seal, crush sleeve (if applicable), oil baffles and slingers (if applicable), marking compound and brush does extensive research for each application to make sure your kit will arrive with all the correct parts you need to install your ring and pinion set. This kit uses Koyo bearings and races along with all high quality small parts. This kit uses Koyo bearings and races along with all high quality small parts. kit includes carrier bearings and races, pinion bearings and races, pinion seal, crush sleeve (if applicable), oil baffles and slingers (if applicable), marking compound and brush. USA Standard Gear does extensive research for each application to make sure your kit will arrive with all the correct parts you need to install your ring and pinion set.