Chevrolet Silverado 2001–2002 — technical service bulletin
Bulletin 020730051 · NHTSA communication 10000761 · issued Dec 1, 2002
Technical service bulletin
communication type
Power Train
component
2001–2002
model years
4
vehicle entries
Official summary
Transmission shifting in and out of 4th and 5th gear (hunting) when pulling / carrying a load, unable to manually select 4th gear. Hd2500/hd3500 series. *tt
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.