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Problem Symptoms Table

WARNING: This page is about a different car, the 2006 Lexus IS 350. However, it is still accessible from the selected car via links, so may be relevant.

Front Differential (for 4WD) 

PROBLEM SYMPTOMS CHART

Symptom Suspected area
Noise in front differential Oil level (Low or wrong grade)
Ring gear or drive pinion (Worn or chipped)
Backlash adjustment (Incorrect)
Preload adjustment (Incorrect)
Tooth contact between ring gear and drive pinion (Incorrect)
Bearing (Worn)
Oil leak from front differential Oil level (Too high or wrong grade)
Oil seal (Worn or damaged)
Seal packing (Damaged)

Rear Differential (for 4GR-FSE) 

PROBLEM SYMPTOMS CHART

Symptom Suspected area
Noise in rear differential Oil level (Low or wrong grade)
Ring gear or drive pinion (Worn or chipped)
Backlash adjustment (Incorrect)
Preload adjustment (Incorrect)
Tooth contact between ring gear and drive pinion (Incorrect)
Bearing (Worn)
Oil leak from rear differential Oil level (Too high or wrong grade)
Side gear shaft oil seal (Worn or damaged)
Seal packing (Damaged)

Rear Differential (for 2GR-FSE) 

PROBLEM SYMPTOMS CHART

Symptom Suspected area
Noise in rear differential Oil level (Low or wrong grade)
Ring gear or drive pinion (Worn or chipped)
Backlash adjustment (Incorrect)
Preload adjustment (Incorrect)
Tooth contact between ring gear and drive pinion (Incorrect)
Bearing (Worn)
Oil leak from rear differential Oil level (Too high or wrong grade)
Side gear shaft oil seal (Worn or damaged)
Seal packing (Damaged)