Larger trucks with an SM420 had open drive also. There should be a lot of open drive type SM420's out there, and you can either swap the entire transmission or just the pieces at the back.
1955 1st GMC Suburban | 1954 GMC 250 trailer puller project | 1954 GMC 250 Hydra-Matic | 1954 Chevy 3100 . 1947 Chevy COE | and more... It's true. I really don't do anything but browse the Internet looking for trouble...
