Ford Mustang 2020–2021 — technical service bulletin
Bulletin TSB 21-2148 · NHTSA communication 10201063 · issued Aug 31, 2021
Technical service bulletin
communication type
Power Train
component
2020–2021
model years
2
vehicle entries
Official summary
Some 2020-2021 Mustang GT500 vehicles may exhibit a transmission fluid leak caused by improperly seated or cracked transmission cooler tubes attached to the transmission case. This may be due to the retaining bolts being cross threaded causing the seals to leak and/or crack the lines. If the threads in the transmission case that the cooler tube retaining bolts go into are damaged, it is not necessary to replace the transmission. These threads can be repaired. To correct the condition, follow the Service Procedure to repair these threads and replace the tubes.
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.