For 1990-2009 cars

Checks | Action
--- | ---
Excessive pinion to ring gear backlash | Adjust the pinion to ring gear backlash. Refer to Backlash Inspection and Adjustment .
Worn pinion and ring gear | Replace the pinion and the ring gear. Refer to the following:

• | Differential Case Assembly Disassemble

• | Differential Case Assembly Assemble

• | Drive Pinion Bearings Replacement

Worn pinion bearings | Replace the pinion bearings. Refer to Drive Pinion Bearings Replacement .
Loose pinion bearings | Adjust the pinion bearings preload. Refer to Drive Pinion Bearings Replacement and to Backlash Inspection and 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 Case Assembly Disassemble and to Differential Case Assembly Assemble .
Loose differential bearings | Adjust the differential bearing preload. Refer to Backlash Inspection and 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 Front Axle Lubricant Level Inspection .
Wrong or poor grade oil | Drain and refill the system with the proper lubricant. Refer to Front Axle Lubricant Replacement .