ok i figured out the problem, after pulling the engine and taking a good look at it, it all made sense, the bottom bolt isnt stripped but the threads on the transmission block are but not completely, just enough to make it a loose fit, after tightening it all down it sits perfectly, but once it's in there for a while the bottom bolt was backing up causing only the top to be held on and when there was too much pressure and the pinion gear started to be at a weird angle, bamm the whole thing would rip apart on the top and since the bottom bolt was still in but not tight it caused the bottom to rip off also and in the process make the internal threads even more worn, i jb welded the whole thing back together (i mean this thing CANNOT break i tried to break it and it wasnt happening) i redrilled and tapped the lower bolt hole slightly larger than it was before and stuck it all back in there this time using a lot of lock-tight on the lower bolt (which was new btw) been driving it for a day and a half and it seems perfect, i checked it this morning and both bolts were still in the same position as they were before, so it looks as though the problem is fixed, seems alot of you were right.

bolt wasnt stripped but internal threads were,
vibrations causing it to become loose (and it was about half an inch backed out when i looked at it)
thanks alot guys