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Service bulletin 020730042A

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10000183
Published by NHTSA2003-02-14
Manufacturer's number020730042A
Manufacturer's date2006-01-01
Replaces020730042B
NHTSA componentPOWER TRAIN

NHTSA's summary

ALLISON TRANSMISSION SERVICE REPAIRS. *TT

The document

No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number.

Components

Transmission and driveline

Vehicles listed
CHEVROLET C45002006
CHEVROLET C55002006
CHEVROLET KODIAK2003 to 2005
GMC C45002006
GMC C55002006
GMC TOPKICK2003 to 2005

Listing a model year does not mean every vehicle of it is concerned: the document says which.