Scody21 said

I was having this same problem with my 4 speed that has a Gear Vendor hooked up to it with all fresh brass and whatnot. So long story short, if the 1-2 shift fork is of the old style that only have pads at the end, the middle of the shift fork does not push the gear slide all the way over the keepers on the gear, so it slides out of gear. You want to ensure use the newer style 3 pad shift forks (pic below) as a pad was added to the middle and it helps fully push the gear slide in place once shifted into 2nd. I found this little gem a few months ago and is the best pricing you'll find for shift forks. NP833 A833 NP440 TRANSMISSION 1-2 FORK Fits '64+CARS WITH BALL & SPRING INTERLOCK DODGE PLYMOUTH CHRYSLER (WT294-23)

Click to expand...