Center bearings support the driveline when using two or more propeller shafts. The center bearing is a ball bearing assembly mounted in a rubber cushion that attaches to the rear axle torque arm in the Camaro and Firebird models. The manufacturer prelubricates and seals the bearing. The cushion allows vertical motion at the driveline and helps isolate the vehicle from driveline vibrations. Since the center bearing is a sealed assembly, it must be replaced as an assembly as it can not be overhauled.