Fred, You are correct about the different diameters. I looked in a '54 shop manual which showed 12" front drums and 14" rear drums for one ton trucks. Another consideration is that front and rear shoes may have different widths, hence different drums even with the same diameter.
When I looked in my Canada parts catalogue, I was amazed at the numerous combinations listed depending on axle size, type of tires, production date, serial # sequence, Budd wheels,etc.. I could not find the part # I pulled from the '46-'72 parts book.
I'm not sure if that is because different #'s are used in Canada, or if different parts are used.
I would verify that front and rear drums are also the same width, if they are listed as the same diameter.
Can I make it any more confusing?
