General guidelines for tuning GM vehicles:

To calculate the PPR properly you use the following formula (old gear / new gear * PPR). To calculate the MPH shift points you can follow this general guide line, reduce the MPH shift scalars and tables by the percent difference in gear change, ex. 3.42 to 3.73, the % difference is about 10%, so you would reduce the all the MPH shift points by 10%. ................
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