Well, I guess if anyone can break one, its me. On my fourth run tonight at the street legals, just brake torquing it to do a burnout, aprox 15psi and it free revs, catches then a horrendous boom, followed by clicking. I shut it off and the starter goes your leaking tranny fluid bad. We push it off the track, a flat deck truck is there so we load it up, I jack up the van hoping an axle shaft let go. No such look, the aluminium diff case is cracked. $140 tow bill home, I guess no more drag racing for me. Sucks, I was just getting this thing dialed in.