Alright, I haven't driven the car in about a month and the transmission worked great last time we had it out. Only reason why I haven't driven it since then is because the weather hasn't been cooperative enough for me to run new steel coolant lines(I had rubber on there). Anyway, I went out there a couple days ago, crank the car up after I changed the lines over and filled it up with fluid. The engine cranks up and the car almost immediately jumps forward...with the shifter in park. So I hit the break, shift to reverse...nothing, shift to neutral...tries to jump forward again, and every gear after neutral makes the car jump too. I got underneath the car and took the linkage off, checked that, it moves back with the shifter put doesn't move forward enough to put the car back in park. We took the linkage off and moved the shifter tab on the transmission by hand to park, and the car still jumps. Everything was the same. The linkage has been removed, anyone have any ideas what could be causing this? I got the trans out of a 77 caprice parts car. The guy I bought it from said that the transmission only had about 10k on it because the engine spun a crank bearing. I'm not quite sure what's causing this. I want to say it's stuck in drive...but if that was the case then it would jump in reverse, but it doesn't move in reverse at all.