Quote:
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Originally Posted by Oldfordowner
While the "Seal Issue" may be valid, consider the two largest causes of leakage from differentials.
Overfilling
Lack of Venting
When checking the differential for fill, the vehicle should be on a LEVEL surface. The fluid should be just below the fill port, not flowing out.
The vent should be checked frequently to make sure it is not glued shut from mud and road dirt.
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Oldfordowner,
I have changed the final drive oil twice myself, but I'm sure I did not overfill, and the vehicle was on a level surface (my garage). However, I have never checked the breather vent. But the axle has never been through water or mud... and not much moisture to speak of based on the weather past year in South Texas...