Is there an updated easy to install synchro 3 or 4 speed tranny that would pretty much fit my 1/2 ton Chevy truck with floor shift and a torque tube driveshaft ?
Or do I have to go to an open driveline first ?
Yes, any 1948-1954 truck 4-speed will be synchronized in up-shifts, and in down-shifts (except maybe from 2nd to 1st).
The standard 48-54 3-speeds would be column shift.