Drove the 39 to a local show saturday and on the way home it poped out of gear (new transmission). I pulled over and messed with the Lokar shifter figuring that maybe I had bumped it enough to take it out of gear. Pulled it down into first and it engaged, second gear same thing but wont actually shift up to second. Same with drive now, wont shift up out of first. Reverse also works fine.

Ive checked the vacuum line and it is fine. What could be the problem? One of my neighbors said it might be the govenor (broken spring). I know nothing of the workings of an automatic. Any ideas?