Analysis of Leakage

WARNING: This page is about a different car, the 2007 Ford Pickup, 2007 Ford F550 Super Duty, 2007 Ford F450 Super Duty, and 2007 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

Clean up the leaking area enough to identify the exact source. An axle leak can be caused by the following:

Axle lubricant level is too high.
Worn or damaged axle shaft seals or differential seals.
Differential housing is cracked.
Flange yoke seal is worn or damaged.
Pinion flange is scored or damaged.
Axle cover is not sealed.
Vent is plugged.

Repair the axle as necessary. Make sure the axle lubricant is at the correct level. Refer to Specifications in this article.