8 3/4 rear casting 1820657

Thanks for the feedback. This car appears to have an A body housing at about 50.3" brake plate flange to flange, or so . I looked for numbers on the housing, but couldn't find any. I suspected it just has spider gears, no posi, but I was only 98% sure about my logic for the 2 wheel turns with an open (spider gear) rear off the ground. It doesn't have tappered axles like my 63 Newport, it has flanged type axles and has a 4.5" bolt pattern and not the normal 4.0" that should have been. It has all RH threaded studs, too. The brakes look like maybe 10" X 1.5", I'm going to try to measure it today.