Hey guys, I'm new here are I just recently bought a 02 Gt with a vortech v-2 setup. Since i've owned the car I changed rear gears to 3.73, and now my speedometer is off. So i bought a sct programmer hoping to recalibrate my speedometer but I am having difficulty just doing changes to the speedometer. The ECM has the vortech chip in the back. Is there any way to only fix the speedometer and not change any of the other parameters? My biggest problem is that in the quarter mile the speedometer reads 120 and shuts the car down before I cross the line. The car runs great and I would rather not have to take it to a dyno shop just to get the speedometer fixed. Any help would be appreciated.