I put a very slight crack in my bell housing, and its an automatic, so I can't just replace the bell housing, I would have to replace the whole transmission which is working perfectly fine. Anybody know a good way to fix this, other than something like J.B. Weld.

 

The bell housing is just a cover for the torque converter, a slight crack shouldn't matter that much. Try the JB Weld or some metal epoxy. Welding it is another option, but I don't know if that should be done with the torque converter in there.