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May 1, 1999 Service bulletin

Concerns with front differential noise

Ford technical service bulletin 996139 for 1997-1999 Ford F-150, 1997-1999 Ford Expedition and 1997-1999 Ford F-250 and others.

Bulletin number
996139
Component
Power train: driveline: differential unit
Summary
Concerns with front differential noise. Tt

Owners of these vehicles have filed 643 complaints in the transmission category.

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