Quoting 14bCrazy:
I got it apart and found the cause. The trans bolts must have come loose and let it move. One of the dowl pins was sheared off and it broke off on of the tabs where it bolts to the block. The other thing it did was break off the sleeve on the bell housing where the input shaft goes in. We are going to have to tig weld the tab back on the block and get another bell housing. Billy is going to take the trans apart but we think the internals are fine. So I have two questions has anybody ever had that sleeve break off of the bell housing? Has anybody ever tried to welds onto a block like that?
I had a similar issue using an evo box on my vr4, only the top two bolt holes and the dowel pins line up (and the bolt underneath from the engine side, but I missed that one!), when launching the car it cracked the bell housing just below each of the top bolts - I never closely examined the rest of the gearbox, but I recall the clutch plate was bent. I ended up selling the box to a mate for parts and dropped another vr4 box into it.