For 1990-2009 cars

Cause | Correction
--- | ---
Inspect for the proper gear oil levels prior to performing system diagnosis. Refer to Axle Lubricant Change .
Loose propeller shaft mounting bolts | Tighten the bolts as required. Refer to Propeller Shaft Replacement .
Worn, loose, or missing differential mounts | Repair or replace the differential mounts as required.
Loose torque tube bracket or a damaged bracket bushing | Tighten the bracket bolts or replace the bracket as required.
Incorrect type fluid Installation of the incorrect type gear oil may create a "moan" type noise within 7 770-25 900 km (3-10,000 miles). Fluid that is "black" in color is to be considered normal and is darkened by the carbon material in the clutch plates. | Replace the rear differential assembly as required. Fluid replacement will not correct a "moan" condition caused by the use of incorrect oil. Refer to Differential Replacement .