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January 1, 2006 Service bulletin

Noise and bump clunk felt when transfer case shifted into four low

Chevrolet technical service bulletin 040421002 for 2004-2006 Chevrolet Colorado and 2004-2006 GMC Canyon.

Bulletin number
040421002
Component
Power train: automatic transmission
Summary
Noise and bump clunk felt when transfer case shifted into four low. Eh

Owners of these vehicles have filed 81 complaints in the transmission category.

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