RFF

Dude I know owns a C4 Vette and he just purchased a hypertech programmer. For some reason unknown to me he ended up programming the car multiple times. First time he programmed the car he chose the "don't have a shift kit function" so a shift kit was installed on his car. However the second time he programed the car he chose the same function. He thinks the program was overlaid twice and now he Vette is shifting to hard. I on the other hand think these programmers are pretty idiot proof so the programmer just over wrote the previous program. Noramlly I wouldn't care what happen to this guy's car, I'm more curious to know the answer myself.

archemedes

I am 99% sure your right since the memory is only so big (it has to take teh old program aka stock and store it it's self) shift kits can make a car shift hard also