Ford F-150 1999 — technical service bulletin
Bulletin 6621 · NHTSA communication 610712 · issued Jul 1, 1999
Technical service bulletin
communication type
Power Train
component
1999
model years
1
vehicle entries
Official summary
Some vehicles with 139 inch wheelbase, 4r70w equipped trucks may exhibit a vibration and transmission fluid leak or bushing spin and / or walk-out during sustained high speed operation. *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.