I don't know about your car, but my '82 300D has a sway bar, and on each end there's a little link about 7" long that goes from the sway bar down to the axle housing. They develop play in the pivots and make all kinds of nasty noises. Cheap to replace, though!

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Richard Wooldridge
'01 ML320
'82 300D 4.3L V6/T700R4 conversion
'82 380SL, '86 560SL engine/trans. installed
'79 450SL, digital servo update
'75 280C