Inspection Before Disassembly for GMC Truck GMC P42 Commercial Chassis 1999

1. Remove the cover and drain the oil.

Important: Use this information in the diagnosis of an axle problem. Information on ring gear backlash also helps in setting shim packs for locating and preloading the differential case.

2. Check the ring gear backlash. Refer to Backlash Adjustment .

Important: If possible, determine the cause the axle problem before disassembly of the axle.

3. Inspect the case for metal chips and shavings. Determine where the chips and shavings came from, such as a broken gear or bearing cage.