I don't know what the difference between the a,b,c and e body backing plates. I haven't made it over to where I store the differential. Maybe tomorrow I can get over there tomorrow to take pictures. I could probably repair them, but I would by new ones if they weren't too pricey.
It's out of 1971 Demon that sat in field for 30+years. It's a small bolt pattern. The brake drums are shot. There badly rusted.
It has 4:10 gear, that's rust pitted. It think I may have bent the drums when trying to get them off. I did find rear drums at Layson restoration.
So I finally broke down and bought a 8 3/4 small bolt pattern differential. Unfortunately the brake backing plates are damaged. Any know if they are reproduced? I can find all the other brake parts in need.
mopar action has info on calipers,oct 2011,rockauto list as remans ,but are new ,so mopar action said.rockauto part # are 18-4406 [ r/s ] and 18-4407 [l/s ]
if the truck has abs brakes or rear anti lock brakes only,most came with rear only anti lock, hydraulic valve could be bad.if this needs to be replace,if i remember correctly was have a scan tool to bleed valve.year of truck would help.