A Drive Axle Shim is a thin piece of metal that is placed between the axle and the bearing housing. It is used to adjust the end play of the axle, which is the amount of axial movement that the axle has within the housing. End play allows the axle to expand and contract due to temperature changes without binding.Attributes: • Manufactured to precise specifications and are built for durability, and reliability• Applications:A Drive Axle Shim is used to preload the pinion and ring gear, which reduces backlash and wear and is used to adjust the alignment of the pinion and ring gear for proper operation.