i called mustang tuning to place a order for gears and a sct xcal2...they said i wouldnt be able to keep the saleen tune and just load a tune for 3.73s, i would have to go to a dyno and rewrite everything just for a gear change...i really want these gears before the racing season ends but i cant get in for a tune in time and i dont want to ride around with my speedo off...what should i do..