Analysis of Leakage
WARNING: This page is about a different car, the 2018 Ford F-550 Super Duty, 2018 Ford F-450 Super Duty, 2018 Ford F-350 Super Duty, and 2018 Ford F-250 Super Duty. 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. A wheel hub leak can be caused by worn or damaged hub seals, worn or damaged axle shaft O-ring or a plugged differential vent.
A plugged rear differential housing vent can cause excessive wheel hub seal wear due to internal pressure buildup.
Verify the differential fluid level is at the correct level. REFER to: Differential Fluid Level Check - Vehicles With: Dana M275. REFER to: Differential Fluid Level Check - Vehicles With: Dana M300.