85 300D. Rattling/clunking under gear shift console, and this flew out from under my car ... it sounds like something is loose and jumping around when I accelerate. Any ideas?

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You might take a look at your driveshaft center support. I suspect that at least one side is loose.

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While you are down there look at the condition of the rear transmission mount. If fluid has been leaking on it; the rubber could be soft and mushy.

Hard to see but try to look at the flex discs on both ends of the drive shaft.

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84 300D, 82 Volvo 244Gl Diesel

tangofox007 X2...one of the bolts that hold the center support driveshaft hanger/bearing support bolts fell out.

It would be better not to drive the car on the road until it is fixed. Not a big job, just get a bolt in advance from a hardware store about two times or a little longer the thickness of the retainer that you pictured.
Get a lock washer too.

Good luck!!!

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