Ford F-250 SD 2020 — technical service bulletin
Bulletin 21B03-S2 · NHTSA communication 10191183 · issued Apr 15, 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 Additional vehicles are now eligible for this repair. Vehicles with a 4.30 axle gear ratio, Vehicles with a 4.10 axle gear ratio, Vehicles with a 4.88 axle gear ratio, Emergency vehicles and wrecker vehicles.
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.