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What part of the vin number will tell me what gear ratio is in a truck I am looking at? Its a 2011 Sierra I was told it had 3.08 in it. Just want to make sure whats in it. Thanks
 

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No part of the VIN will determine that. You would get this information from the RPO tag.

If it is a Duramax, it has a 3.73 gear ratio.
 
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