I have the superchip computer for 2016 jeep Rubicon. I can put tire size gear ratio....etc....going from 17 to 18 hurt gears on my auto....but superchip lined it out.....it just can't get speed cal right. Am I doing something wrong? I plugged tire size, axle ratio, and all in computer...everything shifts great again but speed lies...lol 3 miles an hour too fast
GodsRedneck(0lllllll0)