Ok ! The rear does have 2 large pistons in the factory caliper like 2" dia. each. So its a lot larger area. You can see the cylinders in the pictures of the old calipers.
And yes its a lot larger area then whats in drum brakes.
So with that said. How about me changing my rear end over to a drum brake setup. This means like totally stripping my rear down and replacing everything new. Like back plate, shoes,springs,wheel cylinder,drums and etc. This maybe great and work. But I am wondering about 2 parts,ill throw the rest out. I like to use the rear housing and the axles if I can. The reason being the housing is narrowed and the axles are shorten Moser racing axles.
So it brings me to wonder if both disc and drum axles are factory built the same ? Anyone know or how can i find out if they are the same ?