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Diagnostic Routine - Noise (Howl/Moan) In All Or More Than One Drive Modes

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 - NOISE (HOWL/MOAN) IN ALL OR MORE THAN ONE DRIVE MODES

Possible Component Reference/Action
Axle bearings INSPECT differential and pinion bearings. INSTALL new bearings.