Pigpen is correct. My old boss had a Mercedes with a rear end that looked just like that. I believe the car was a 1979.
You are all wrong. It's obviously a Buick LeSabre Quad-ra-Matic front axle. You can tell that by the finned drums. Duh, ALL Buicks have finned drums. Ooppps, time for my meds, excuse me... Cosmo