Chevrolet Colorado 2004–2006 — technical service bulletin
Bulletin 040421002 · NHTSA communication 10012181 · issued Jan 1, 2006
Technical service bulletin
communication type
Power Train
component
2004–2006
model years
6
vehicle entries
Official summary
Noise and bump clunk felt when transfer case shifted into four low. *eh
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.