Two days ago, my 1968 W108 280S started making a clunking sound in the rear end when going approximately 2-3 mph (whether in forward or reverse). The sound is similar to a cow bell. Today, I also felt some very slight vibrations when going 30-40 mph.

I think I have eliminated the possibility of items rolling around in my trunk or a loose muffler/exhaust. Is this a potential driveshaft problem similar to what is discused in the below thread?

http://www.peachparts.com/shopforum/vintage-mercedes/205055-what-happens-when-you-ignore-little-driveline-vibration-2.html

Any thoughts are appreciated.

CNM