Ford Expedition 1997–1999 — technical service bulletin
Bulletin 99143 · NHTSA communication 608419 · issued Jul 12, 1999
Technical service bulletin
communication type
Power Train
component
1997–1999
model years
11
vehicle entries
Official summary
Some 4x4 vehicles built with center disconnect front axles may exhibit a moaning noise from the front differential while operating in 4x2 mode. *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.