1972 Dodge Colt

So I got the Dana cleaned today. How in the H can a drag car get a part that dirty? I have seen 300K mile trucks with less crap on it than this rear. I do have a couple ideas, ford Dana rears have the cover screws drilled all the way through. Oil can run through those tread and get on the back side. And I guess if you never wipe it down, it just gets worse.
Then today I discovered using the Strange Catalog that the Dana ends I have are not ford, but are olds. I guess when one of the PO's changed from disks to drums (Why?) they cut the tops flat on the axle ends, making them look like big ford. After getting the axles and backing plates off I can see the cuts. And of course they aren't the same. But good to know I need olds bearings to replace the ones I am getting removed tomorrow. IMG_0640.JPG IMG_0642.JPG IMG_0643.JPG