My 1979 300D started making a very loud and concerning metal on metal rattle about two days ago on my home. I didn't do anything to warrant it either, it just started around a 90 degree right turn at about 15 mph. Now, it makes the sound which comes equally from both sides every time I turn right at greater than 5 mph and progressively gets faster with speed. It is definitely a rotational sound too. I thought initially it was the exhaust contacting the driveshaft so I re-hung the exhaust with some beefy c-clamps but that wasn't it and I see no wear marks anywhere on the driveshaft, on the coupling to the rear end or to both wheels. The sound is also there to a much lesser extent going over bumps.
Any ideas??
Thanks,
Brandon