For 1990-2009 cars

Cause | Correction
--- | ---
Inspect for proper gear oil levels prior to performing system diagnosis.
Loose propeller shaft mounting bolts | Tighten the bolts as required. Refer to Fastener Tightening Specifications .
Worn propeller shaft constant velocity joint. | Replace the propeller shaft assembly. Refer to Propeller Shaft Replacement . A worn propeller shaft constant velocity joint may create a clicking, grinding, or snapping type of noise.
Worn or loose center bearing assembly | Replace the center bearing assembly as required. A worn center bearing assembly may cause vehicle vibration or a grinding or squealing type of noise.
Worn universal joints | Replace the universal joints as required. A worn universal joint may create a clicking or a snapping type of noise. Refer to Propeller Shaft Replacement .
Worn axle shaft constant velocity joints. | Replace or repair the constant velocity joints as required. A worn axle shaft constant velocity joint may create a clicking, grinding, or snapping type of noise. Refer to Symptoms - Rear Drive Axle .
Transfer case noise | Refer to Symptoms - Transfer Case .
Worn or damaged axle mounting bushings (Side) | Check the bushing position and replace the bushings as required. A worn bushing may create a clunk type of noise during acceleration or deceleration or wrong orientation. Refer to Differential Housing Support Bushing Replacement .
Worn or damaged axle mounting bushings (Rear) | Replace the bushings as required. A worn bushing may create a clunk type of noise during acceleration or deceleration. Refer to Differential Housing Support Bushing Replacement .
Loose rear mounting bracket | Tighten the bracket bolts as required. Refer to Fastener Tightening Specifications .
Loose or damaged prop guard | Repair or replace as required. A loose dust shield may contact the propeller shaft assembly and create a scraping or grinding type of noise.
Bearing noise within axle assembly | A grinding or roar type of noise will increase or decrease relative to vehicle speed.

1. Check for the proper fluid level. Refer to Rear Axle Lubricant Replacement .
2. If the noise continues, repair or replace the unit as required.

Gear set whine noise within axle assembly created by incorrect gear backlash | A whine type of noise will increase or decrease relative to vehicle speed.

1. Check for the proper fluid level. Refer to Rear Axle Lubricant Replacement .
2. Repair or replace the unit as required.