37's are within 10% of stock. The 10 speed has a really low 1st gear. Neither engine will really struggle.
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 ?
Am I reading that right? They gave you the answer and your response is , I'm trusting it anyway?
Have you ever heard me say, "I don't do irrational"?
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