Weird 727 problem

Ok to make a long story short, last thanksgiving I was driving my duster when a steel plate that covers road trenches wobbled and caught my headers square, was a solid impact and it mangled my headers, the car sat, and sat, and finally got some insurance money, I bought a nice used set of TTi's for cheap, I never played with the shifter from the momment it got off the tow truck, it rolled back and forth no problem.

The problem I have now is it rolls forward but when I try to roll it backwards it binds up and won't move, like it stuck in park. The only thing I played with during the header install was the linkage, B&M, which I removed and put back, Also there is a weird long bolt looking thing above the front trans cooler line, it has a nut and like a square head on it, i removed that and sealed it because it was leaking fluid, could this have done something inside the trans to keep it from rolling in reverse? no matter what gear I'm in nuetral, reverse, D 1 or 2 it rolls forward but not in reverse.. any ideas? could I have broken something inside the transmission?

Thanks
-Chris