Chevrolet Silverado 2001–2005 — technical service bulletin
Bulletin 020730004 · NHTSA communication 631800 · issued Sep 1, 2006
Technical service bulletin
communication type
Power Train
component
2001–2005
model years
10
vehicle entries
Official summary
New product information, grade brake feature of allison 1000 series transmission. *slc this bulletin replaces 02-07-30-004. *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.