When undoing trans bolts, never assume that all bolts are identical. I was all pissed off that I thought I had found a stripped thread in the engine casing because it just spun round and round when I turned it. Turns out that the left side trans bolt threads into the case and the right side bolt goes all the way through the case and has a nut attached to the back. Damn it. The worst part is that I didnt figure this out on my own. I got pissed off and posted asking about tapping new threads in the engine case, etc. Someone replied and said "uhhh, did you take the nut off the back of that bolt?"
Live and learn. I wont forget now.