Ford F-250 SD 2020 — technical service bulletin
Bulletin 21B03-S3 · NHTSA communication 10194439 · issued May 5, 2021
Technical service bulletin
communication type
Power Train
component
2020
model years
4
vehicle entries
Official summary
Certain 2020 Model Year Super Duty F250-F600 Vehicles Equipped with a 10R140 Transmission - Number One Planetary and Ring Gear Assembly Parts to repair this condition are now available in sufficient quantities to service all of the affected vehicles. All VINs have been activated. All owner notification through Supplement #2 is complete as of the end of April 2021.
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.