I found that the only way my 54's hinge pins would come out was with a torch and a 5 ton press. They can be REALLY stubborn. A shop with a press will be a good thing to locate.
Good luck.


1956 GMC 100 NAPCO Deluxe
1955.1 Chevy 3600 NAPCO
1954 Chevy 3600 NAPCO