Swoop...my information is from doing brake jobs on some of these older C500's, just so you know.
There is bolts on the front side of the frame that are in a half moon arc and on the back side there is nuts, the axle assembly has studs that are quite long that go thru, when you pull the axle assembly off you are pulling the drive shaft along with it, this whole assembly weighs a good 100 lbs or more, the front of the assembly is a planetary gear style drive unit that is why the brake shoes and hardware are on the back side of the drive unit, it is a bear to get to them so when you do get it off is good to replace all parts and hardware while in there so you don't have to "go in" a second time. there is a small brake line on the inside that I would definitely replace as it never comes out and is usually rusted fast and twists when trying to remove it