WTF happened??

So I was at the track the other weekend and ripped the perches off the housing right at the hit of the throttle, held up the whole day before but put more pinion angle in and it bit harder then ever and then crunch, perches ripped off, driveshaft got pressed up to the trans tunnel, pinion got aimed way up and I was done. Crap. So I got it all together and welded really well this time, hooked up the nitrous kit and wanted to go back yesterday. I pulled out of the shop for a test drive and when I went to 2nd gear it just locked and skidded to a stop in the middle of the road! I was very unhappy and let down after being up til 5am working on the fart box. I limped back the whole 75ft in first gear then in my driveway I stopped and tried to leave in 2nd, won't go. Tried 3rd, same thing. Any ideas what's wrong in my race prepped 904 that always felt great.

Thanks FABO and this brings this years tally up to 1 broke block, 1 exploded 727, 1 set of main bearings after a Crane gold rocker failed and let metal loose. I'm 21, exhausted, and feel like this thing is kicking my ***, oh well bet I put it back together anyway lol