I just got a mail order tune from TSP and they firmed up my tranny, but i already have a shift kit. Will this hurt anything? They said it would make the shift kit wear out quicker but wouldnt really hurt my tranny. So should i send it back and get my shift firmness back to stock form? thanks!

 

If you have the Shift kit in there now and like the part throttle shifts, then the computer chip could firm up the part throttle shifts even more and that could be too much.