I have a 1963 Galaxie 500 with a 390 and a C6 transmission. The motor is a C6ME-A, so I assume the transmission to be of a similar (1966) vintage. I park on a slight hill, facing down. This morning, I put the car into a forward gear, hit the throttle and only rolled downhill did not pull forward under power. I put the car into Park, and it stayed put on the hill. I put it into Reverse, and it rolled forward downhill. I put it into a forward gear, and it rolled forward downhill. In every position of the shifter except Park, it felt as if I was in Neutral. I followed the shift linkage and it all appeared to be moving correctly. I crawled under the car and was able to move the shifter arm on the side of the transmission by hand, and felt a notch for each gear position. It was not a crisp feel as I turned the arm, but there were vague notches. Eventually, I put the shifter into reverse (using the column) and gave it a quick burst of throttle, and Reverse engaged abruptly and I got it back to its parking spot. Ive had the car only two weeks, and up until now have had no troubles with the transmission. Its been somewhat difficult to find gears, but once I find them, it seems to shift normally. The fluid level is good. The car was sitting up for a few years before I found it for sale. Any ideas on what may be up? I'd like to pull the pan and swap the filter. Anyone know the correct part number for the filter kit? Thanks!