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Home >> Lexus >> 2008 >> IS 350 >> Repair and Diagnosis >> Drivelines & Axles >> Differentials & Drive Axles >> Differential >> Differential System >> Problem Symptoms Table

Problem Symptoms Table

Front Differential (for 4WD) 

PROBLEM SYMPTOMS CHART

Symptom Suspected area See
Noise in front differential Oil level (Low or wrong grade) DIFFERENTIAL OIL 
Ring gear or drive pinion (Worn or chipped) FRONT DIFFERENTIAL CARRIER ASSEMBLY (FOR 4WD) 
Backlash adjustment (Incorrect) FRONT DIFFERENTIAL CARRIER ASSEMBLY (FOR 4WD) 
Preload adjustment (Incorrect) FRONT DIFFERENTIAL CARRIER ASSEMBLY (FOR 4WD) 
Tooth contact between ring gear and drive pinion (Incorrect) FRONT DIFFERENTIAL CARRIER ASSEMBLY (FOR 4WD) 
Bearing (Worn) FRONT DIFFERENTIAL CARRIER ASSEMBLY (FOR 4WD) 
Oil leak from front differential Oil level (Too high or wrong grade) DIFFERENTIAL OIL 
Oil seal (Worn or damaged) FRONT DIFFERENTIAL CARRIER ASSEMBLY (FOR 4WD) 
Seal packing (Damaged) FRONT DIFFERENTIAL CARRIER ASSEMBLY (FOR 4WD) 

Rear Differential (for 4GR-FSE) 

PROBLEM SYMPTOMS CHART

Symptom Suspected area See
Noise in rear differential Oil level (Low or wrong grade) DIFFERENTIAL OIL 
Ring gear or drive pinion (Worn or chipped) REAR DIFFERENTIAL CARRIER ASSEMBLY (FOR 4GR-FSE) 
Backlash adjustment (Incorrect) REAR DIFFERENTIAL CARRIER ASSEMBLY (FOR 4GR-FSE) 
Preload adjustment (Incorrect) REAR DIFFERENTIAL CARRIER ASSEMBLY (FOR 4GR-FSE) 
Tooth contact between ring gear and drive pinion (Incorrect) REAR DIFFERENTIAL CARRIER ASSEMBLY (FOR 4GR-FSE) 
Bearing (Worn) REAR DIFFERENTIAL CARRIER ASSEMBLY (FOR 4GR-FSE) 
Oil leak from rear differential Oil level (Too high or wrong grade) DIFFERENTIAL OIL 
Side gear shaft oil seal (Worn or damaged) REAR DIFFERENTIAL SIDE GEAR SHAFT OIL SEAL 
Seal packing (Damaged) REAR DIFFERENTIAL CARRIER ASSEMBLY (FOR 4GR-FSE) 

Rear Differential (for 2GR-FSE) 

PROBLEM SYMPTOMS CHART

Symptom Suspected area See
Noise in rear differential Oil level (Low or wrong grade) DIFFERENTIAL OIL 
Ring gear or drive pinion (Worn or chipped) REAR DIFFERENTIAL CARRIER ASSEMBLY (FOR 2GR-FSE) 
Backlash adjustment (Incorrect) REAR DIFFERENTIAL CARRIER ASSEMBLY (FOR 2GR-FSE) 
Preload adjustment (Incorrect) REAR DIFFERENTIAL CARRIER ASSEMBLY (FOR 2GR-FSE) 
Tooth contact between ring gear and drive pinion (Incorrect) REAR DIFFERENTIAL CARRIER ASSEMBLY (FOR 2GR-FSE) 
Bearing (Worn) REAR DIFFERENTIAL CARRIER ASSEMBLY (FOR 2GR-FSE) 
Oil leak from rear differential Oil level (Too high or wrong grade) DIFFERENTIAL OIL 
Side gear shaft oil seal (Worn or damaged) REAR DIFFERENTIAL SIDE GEAR SHAFT OIL SEAL 
Seal packing (Damaged) REAR DIFFERENTIAL CARRIER ASSEMBLY (FOR 2GR-FSE)