Thanks guys. Joe, I could not determine what group 4.337 was telling me when I looked. I do not think those tooth count published numbers relate to the driven gear that the cable goes into unless I am missing something.......
I would like to be able to find a reference for the tooth count on the driven gear(cable affixes to) to the various ratios. But the real issue for me since my SM420 is from a 59 NAPCO 3/4 ton frame, is how to determine what the INSIDE of the gearbox has in it for the other half of the driven/drive combo....
An adapter would be fine, but as Denny mentioned, the driven gear should match in a mechanical mesh so as not to be tearing either part up in the crashbox. I never thought to check that drive gear before installing the gearbox back in the truck. Live and learn....I will get it figured out even if it is trial and error.
