I went junk yard shopping this weekend and found a SM420 tranny that was in fairly good shape. On the back of the 4-speed required a U-joint connection for the driveshaft, being different from the splined configuration on the current 3-speed. Also one man said that the clutch needs to be modified. Are the pilot bushing dimensions and splines the same? Is this the right transmission? The numbers on the 4-speed made it appear to be from 1964-1967. Is there a different tranny that would work better or should I go with this one? Also where should the slip yoke be placed in the driveline--right after the transmission or halfway in between using 2 drive shafts? I was hoping this would be a fairly simple swap, but after looking at the 4-speed in person, more problems appear.
Thanks for the help.
Adam
