Ford Expedition 1997–1999 — technical service bulletin
Bulletin 996139 · NHTSA communication 606989 · issued May 1, 1999
Technical service bulletin
communication type
Power Train
component
1997–1999
model years
12
vehicle entries
Official summary
Concerns with front differential noise. *tt
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.