Rear Axle Lubricant Leak Diagnosis

WARNING: This page is about a different car, the 2004 Chevrolet Corvette. 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 Lubricant Change and Lubrication Specifications .
Restricted or damaged vent valve assembly	Repair or replace the vent valve as required.
Worn, scored, or missing drain and/or fill plug sealing washers	Install new sealing washers and tighten the plugs per specifications.
Damaged speed sensor and/or O-ring seal	Replace the speed sensor and/or the O-ring seal as required.
Leaking transmission mounting stud	Remove the mounting stud, and reseal the threads.
Rear cover O-ring seal	Replace the rear cover O-ring seal.
Left or right 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.
Worn or damaged carrier seal plate O-ring or oil seal - automatic transmission only	Replace the O-ring and oil seal as required.
Housing or side cover porosity	Replace the housing and/or the covers as required.