Rear Axle Lubricant Leak Diagnosis

Cause	Correction
Restricted or damaged ventilation tube assembly	Replace the ventilation tube as required.
Leaking fill or drain plug	Install sealant Saturn P/N 21485278 or equivalent onto threads of plugs and tighten. Refer to Fastener Tightening Specifications .
Leaking input flange seal	Inspect the input flange surface for excessive wear or damage. Inspect the front bearing for wear or damage. A worn bearing may allow excessive movement of the clutch pack input shaft. Replace the components as required.
Leaks at the housing sealing surfaces	Dissemble the axle and reseal the sealing surfaces as required. Refer to Differential Housing Assembly Disassemble .
Worn or damages axle shaft oil seals	Replace the axle shaft oil seals as required.
Axle housing porosity	Replace the housing(s) as required. Refer to Rear Axle Shaft Seal Replacement - Left and Rear Axle Shaft Seal Replacement - Right .