thanks for the detailed explanation 6cyls. i think i got it. i had previously loosened the collar and took the 4 bolts out, but the bell didn't turn or move so i wasn't sure what to do after that. sounds like i just need to give it some persuasion.
i'll write up what i find out.
tony

Overland Blue, 1953 GMC 1/2T, 100-22, 228/1bbl, 4sp/4.10 6v, shortbed/fender side/5-window.