Re: What bolt is this in my transmission housing?!
I would not expect a leak in the bellhousing, because then it would come out from the lowest part, which is the engine to transmission cover, which has a drain hole in it. I would take that bolt out and check whats behind it. Then just use some RTV on the threads of the bolt and head and put it in.
This has nothing to do with being a jeep, but with a previous owner or mechanic who did something strange.