Hey i have a 03 mach 1 with a auto tranny. I have 4 :10 gears and a shift kit in it. Last nite i was racing and it kinda slipped wen i floored it.. also it took along time to go into overdrive n it wud go bak to 3rd. Qnd it wud stay in 3rd gear.. took overdrive off n drove fine. Took it to a tranny place n they put it on the machine n the computer said all gears were fine, but wen i left it stayed the same? Any suggestions? Or answers