So i recently insalled 3.73s from 3.31 on my 2013 mustang 5.0 with a manual transmission. And for the life of me i cannot seem to figure out how to correctly tune on the SCT tuner for the gear change. I have an MPT performance tune on the car to adjust for other mods i have. So with this tune already uploaded i would simply go to the strategy tune section and change the gear ratio and start to upload those changes. But once i drive with that change made the car is no longer on my MPT tune anymore? So im obviously doing something wrong so could someone walk me through the steps of changing my gear ratio and have my normal performance tune but have the correct speed on my speedo...
Thanks
Thanks