A couple of months ago I spent an insane amount getting replacement clutch kit, shifter and transmission (5-speed, not auto) in my truck. I was ready to shoot the truck when I found some oil dripping from the transmission case recently, and almost had a heart attack when I thought about MORE transmission trouble. I took it back to the shop, and the issue actually had nothing to do with the transmission - a gasket near the top of the engine was leaking oil down the back of the engine. The way it dripped down looked like I was leaking fluid from the transmission gasket, but it was really a minor repair.
I have an honest mechanic, so I got out of there for $60 for the new gasket's installation and a confirmation that the transmission was okay. Maybe you have somthing similar going on?