stock trannies will hold upto about 500. i raced my setup at 460rwhp for a couple passes with no problems. motor blew, then used the same tranny for the next 2 seasons at 400rwhp pulling 1.6's to 1.4's in the 60. even before the 460rwhp setup i was racing on that tranny with 320rwhp for 2 seasons.

its the launches that break the input/output shafts. If people got a soft clutch, not a 4 puck double sprung diaphram......everyone would be ok.