even a trans with a shift kit you will only see a benefit on the street when putting your foot down and trying to race someone. If you want a shift kit build a hotrod
Try this link here... I had one in my racer until I blew 2nd gear on my AW4. Went a different route on the tranny.. Just sold mine and worked great. Had the TC lock up capability and could switch into shifter mode or standard (computer controlled) mode..