Chevrolet Silverado 2001–2004 — technical service bulletin
Bulletin 080403 · NHTSA communication 10003869 · issued Aug 4, 2003
Technical service bulletin
communication type
Power Train
component
2001–2004
model years
8
vehicle entries
Official summary
This vme message applies to the valve body for the allison series 1000 transmission revised for the 2004 model year to add modulated main pressure control. This revision will provide additional transmission oil cooler flow and reduce pump load during certain low speed operating conditions. *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.