Bad news. The problem was a bad u joint, but I didn't fix it soon enough and the vibration actually cracked the transmission case, they showed me the crack. That's why the gear oil leaks out.

Kicking myself right now for not noticing and fixing the vibration sooner, and looking into the option of putting in a used/pulled transmission. The shop of course wants a lot of money, what they would recommend is rebuilding the whole transmission in a new case, they want about 2200 for the whole job if we went that route. Not gonna do that. If they quote me a decent price to put in a used one, I'll go that route, otherwise I'll tow it home and park it until fall when maybe I'd have time to do the swap myself and the weather will be cooler.

I thought the vibration was the engine running rough because I had a check engine light and ended up finding a vacuum leak, but it still was vibrating, and I thought maybe I had a bad injector, or spark plug or something <img src="/forums/images/graemlins/frown.gif" alt="" />