GM Service Manual Online
For 1990-2009 cars only

Checks

Action

Excessive pinion to ring gear backlash

Adjust the pinion to ring gear backlash. Refer to Backlash Adjustment.

Worn pinion and ring gear

Replace the pinion and the ring gear. Refer to Drive Pinion and Ring Gear Replacement.

Worn pinion bearings

Replace the pinion bearings. Refer to Drive Pinion Bearings Replacement.

Loose pinion bearings

Adjust the pinion bearings preload. Refer to Pinion Depth Adjustment.

Excessive pinion end play

Adjust the pinion end play. Refer to Pinion Depth Adjustment.

Worn differential bearings

Replace the differential bearings. Refer to Differential Side Bearings Replacement.

Loose differential bearings

Adjust the differential bearing preload. Refer to Differential Carrier Bearing Preload Adjustment.

Excessive ring gear runout

Replace the ring gear. Refer to Drive Pinion and Ring Gear Replacement.

Low oil level

Fill the fluid level to specifications with the proper lubricant. Refer to Rear Axle Lubricant Level Inspection.

Wrong or poor grade oil

Drain and refill the system with the proper lubricant. Refer to Rear Axle Lubricant Replacement.

Bent axle housing

Replace the axle housing. Refer to Rear Axle Housing Replacement.