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If you are using TunerCat to reflash under tools there is a speedo calibration, just enter tire size, diff ratio, trans (M or A), etc. and then calculate.
Thanks for the info on the speedo calibration. I don't think that will adjust the transmission tables unfortunately. I need the tables with the proper shift point(mph) for a 3.07 geared car.
It will adjust the transmission tables if you let it, it will ask if you want the transmission tables adjusted and will make the necessary changes.