The only 5 speeds available at that time were in the real big trucks & would be impractical in a pickup. You can put in the 3 speed with o-drive but they are pretty hard to find & create problems with controls & linkage. The best one to use is the S-10 Borg-Warner 5 speed, especially since you have the floor shifter already. It takes some mods. but they are simple & there is much info. on this websight & plenty of guys to help. I,ve done 2 of them & they work great. I,m going to put one in a 49 Ford panel soon behind a flathead V-8.
