Went to drive overto the goodguys show yesterday and made it about 15miles before I started to smell oil... Noticed some a little smoke coming from under the seat so pulled over fast.. motor is kinda tired so it has some blow by but when I looked under it seemed to be coming from the passenger side rear of the trans.. I looked and found this open hole... I changed the oil in it last August but can't say that I remember seeing anything missing It is straight across from where the speedo cable is on the drivers side.. I'm not really familiar with these.. from what my buddy had said when he was still around and built the car is that it was the early (49) merc trans.. Not sure what is supposed to be in that threaded hole... Thought about having a place here in Ohio (vanpelt sales) go through the overdrive section to make sure everything is good inside. Sent from my iPhone using H.A.M.B.