Iam going to granny shift it no speed shifting or power shifting for my stock tranny. So the stock tranny will hold up fine. Since the drag strip is a couple of hrs away from me I doubt that I will be racing more than a few times a year and once I get my lowest et thats enuff for me. If you go all the time thats when thing start breaking. As far as I know nobody makes an aftermarket tranny. All you can do at this point is change the stock clutch to a heavy duty clutch, pressure plate and flywheel or step up to a race puck style clutch.