Chevrolet Express 2001–2006 — technical service bulletin
Bulletin 060601003 · NHTSA communication 10019474 · issued Jan 1, 2006
Technical service bulletin
communication type
Engine and Engine Cooling
component
2001–2006
model years
14
vehicle entries
Official summary
Information on longer main bearing cap bolts required for certain 2001-2006 lb7, lly, lbz duramax diesel engines. *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.