March 1, 1999 Service bulletin

Some 4X4 vehicles may exhibit a moan noise from the front differential when the vehicle is operating in...

Ford technical service bulletin 12590 for 1997-1999 Ford F-150 and 1997-1999 Ford F-250.

Bulletin number: 12590
Component: Power train: driveline: differential unit
Summary: Some 4x4 vehicles may exhibit a moan noise from the front differential when the vehicle is operating in 4x2 mode and goes away when operating in 4x4 mode. Tt

Owners of these vehicles have filed 405 complaints in the transmission category.

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