Rear Differential Symptom Troubleshooting

Most problems in the unit are to be diagnosed by identifying noises from the gears or bearings.
Care should be taken during diagnosis not to confuse differential noises with those from other drivetrain components.

Symptom Probable Cause Remedy 
Will not go into 4WD mode 
  • Fluid level too low
  • Incorrect fluid type
 
  • Add fluid
  • Replace
 
Will not return to 2WD mode Incorrect fluid type Drain and fill the differential 
Gear or bearing noises 
  • Fluid level too low
  • Incorrect or worn out fluid
  • Damaged or chipped gears
 
  • Add fluid
  • Drain and fill the differential
  • Replace the differential carrier assembly
 
Overheating 
  • Fluid level too low
  • Incorrect fluid type
 
  • Add fluid
  • Drain and fill the differential
 
Fluid leak 
  • Fluid level too high
  • Clogged breather hose
  • Worn or damaged oil seal
  • Damaged sealing washer
  • Loose mounting bolts or inadequate sealing
 
  • Lower to proper level
  • Clean or replace
  • Replace
  • Replace
  • Recheck torque or apply sealant