There's more to the disassembly of an axle than you may think. For instance, the bearing caps must be marked so they can be reinstalled in exactly the same position. In addition, careful attention has to be paid to what thickness shims were used from the factory. Most of the time, using the same thickness of shims will get you in the ballpark for reassembly. Here, the old pinion bearing is removed from the pinion shaft so the shim can be removed and measured.