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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1121 (Rear Drive Axle) >> Diagnostic Information and Procedures >> Rear Axle Lubricant Leak Diagnosis

Rear Axle Lubricant Leak Diagnosis

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
Cause Correction
IMPORTANT: Upon completion of all repairs, refill the axle with the proper amounts of axle lubricant and friction modifier additive. Refer to Rear Axle Lubricant Level Inspection  and Lubrication Specifications .
Restricted or damaged vent valve assembly Repair or replace the vent valve as required.
Left side cover O-ring seal Replace the side cover O-ring seal as required.
Worn or damaged axle shaft oil seals Replace the axle shaft oil seals as required.
Housing or side cover porosity Replace the housing and/or the covers as required.
Loose Drain or Fill Plug Tighten to specification
Pinion Cage Assembly O-Ring
  • Pull Cage Assembly
  • Replace O-Ring