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Problem Symptoms Table

WARNING: This page is about a different car, the 2008 Lexus LS 600hL. However, it is still accessible from the selected car via links, so may be relevant.

Front differential 

FRONT DIFFERENTIAL PROBLEM SYMPTOMS REFERENCE

Symptom Suspected Area See Procedure
Noise in front differential Oil (Level low or wrong grade) DIFFERENTIAL OIL 
Ring gear or drive pinion (Worn or chipped) FRONT DIFFERENTIAL CARRIER ASSEMBLY 
Backlash adjustment (Defective) FRONT DIFFERENTIAL CARRIER ASSEMBLY 
Preload adjustment (Defective) FRONT DIFFERENTIAL CARRIER ASSEMBLY 
Tooth contact between ring gear and drive pinion (Defective) FRONT DIFFERENTIAL CARRIER ASSEMBLY 
Bearing (Worn) FRONT DIFFERENTIAL CARRIER ASSEMBLY 
Oil leak from front differential Oil (Level too high or wrong grade) DIFFERENTIAL OIL 
Oil leak from front differential FRONT DIFFERENTIAL CARRIER ASSEMBLY 
Seal packing (Damaged) FRONT DIFFERENTIAL CARRIER ASSEMBLY 

Rear differential 

REAR DIFFERENTIAL PROBLEM SYMPTOMS REFERENCE

Symptom Suspected Area See Procedure
Noise in rear differential Oil (Level low or wrong grade) DIFFERENTIAL OIL 
Ring gear or drive pinion (Worn or chipped) DIFFERENTIAL CARRIER ASSEMBLY 
Backlash adjustment (Defective) DIFFERENTIAL CARRIER ASSEMBLY 
Preload adjustment (Defective) DIFFERENTIAL CARRIER ASSEMBLY 
Tooth contact between ring gear and drive pinion (Defective) DIFFERENTIAL CARRIER ASSEMBLY 
Bearing (Worn) DIFFERENTIAL CARRIER ASSEMBLY 
Oil leak from rear differential Oil (Level too high or wrong grade) DIFFERENTIAL OIL 
Oil leak from rear differential DIFFERENTIAL CARRIER ASSEMBLY 
Seal packing (Damaged) DIFFERENTIAL CARRIER ASSEMBLY