37's are within 10% of stock. The 10 speed has a really low 1st gear. Neither engine will really struggle.
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There is only one device currently that can trick the computer to correct for tire size, there are no programmers that work on the global B trucks that I am aware of, so programming the transmission shift points for re-gearing isn't possible at this time that is why there are no parts available for it.
18-NA-125 is the document from the OEM, GM, and yet; and although they give a full and detailed discussion of the inputs and outputs your conclusion is ?
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Am I reading that right? They gave you the answer and your response is , I'm trusting it anyway?Â
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Have you ever heard me say, "I don't do irrational"?
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