I picked up a 64-67 vintage SM420 4-speed that I want to swap into a 57 3100 with the original 3-speed set up intact. I don't know what size truck that the 4-speed came out of, just its approximate age. Did GM use the same driveshafts from 57 to the mid 60's? Same driveshaft in a 57 3-speed as a 57 with the optional SM420? There is a front yoke still attached to this mid 60's SM420 that I hope will attach to the original 3-speed driveshaft. I don't have the 57 in my possession yet to eyeball it in person. I'm hoping that there wasn't some special 55-59 only 3100 SM420 yoke to hunt down. Thoughts?

1946 Chevy pickup, 1948 Chevy suburban, 1950 Chevy pickup, 1952 GMC pickup, 1957 Chevy pickup, 1939 Chevy pickup