I have a strange thumping noise coming from the rear of my '81 300TD. I have not been able to find what it is, but here is my blind description:
Going over bumps sounds like something is bouncing up and down on my fuel tank. I can get the same results when car is parked and I bounce on the tailgate a little. Sounds metal...almost as if there were possibly an exhaust mount bracket or something loose and hanging. I REALLY do not want to have to remove the tank without asking the experts first!
Anyone had a similar annoying noise?

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Current: '91 300TE 4MATIC 317k and climbing...
Former:
'81 300TD Wagon 168K "Tank"
'83 240D 216K 4spd manual "Da Bear" (aka best car ever)

"Never sweat the petty things...
and never pet the sweaty things."

I had a similar rattle that only ocuured when I would hit a sharp bump at low speeds. It turned out to be the foam blocks inside the rear bumper
(these are the impact absorbtion blocks) My car is a 124 so I don't know if the bumper on yours is constructed the same. It took me three years to isolate that clunk as it didn't happen all the time.

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Dave
88 300E 250K Sold
2000 C230K Totaled @104K
2003 ML320 156K Sold
2009 E350 4Matic Sport 46K Sold
2011 ML350 60K Sold
2014 GLK350 46k Sold
2012 GL450 72K For Sale
2016 E550 Cabriolet 48K Sold
2015 GLK350 114K