Yes. That extrusion of cast iron blocks the use of a long guide pin on the upper right side. I used a short pin there as shown in the first picture.

The extrusion on the transmission has a threaded hole also seen in the picture. It must be the pivot point for a hand parking brake found in some (all?) of the larger trucks. 2nd pic.
Attachments
Guide Pins 2.jpg (42.57 KB, 55 downloads)
Parking Brake on SM420.jpg (56.21 KB, 56 downloads)

Last edited by Wally / Montana; 12/02/2021 5:52 PM.

1948 3/4-Ton 5-Window Flatbed Chevrolet

34 Years. Now with a '61 261, 848 head, Rochester Monojet carb, SM420 4-speed, 4.10 rear, dual reservoir MC, Bendix up front, 235/85R16 tires, 12-volt w/alternator, electric wipers and a modern radio in the glove box.