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Diagnostic Routine - Fluid Loss

WARNING: This page is about a different car, the 2004 Ford Pickup, 2004 Ford F550 Super Duty, 2004 Ford F450 Super Duty, 2004 Ford Excursion, and 2004 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC ROUTINE - FLUID LOSS

Possible Component Reference/Action
Vent CLEAN the axle vent and vent hose.
Overfilled axle CHECK the lubricant level for specific amount.
Fill plug CLEAN the area around the plug. REMOVE the plug. APPLY pipe sealant and INSTALL the plug.
Halfshaft oil seal INSTALL a new halfshaft oil seal.
Pinion seal INSTALL a new pinion seal.
Differential housing cover RESEAL the differential housing cover.