when i drive my car, as i'm rolling along i hear a rumbling/clunking from the back of the car...it sounds kind of like something is loose and jiggling around and hitting up against something else in rapid succession. what could it be?

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1985 300D Turbo "Eunis"

Have you checked your trunk for small animals ?
Could be CV joints or wheel bearings or bearings or ujoints in the driveshaft...
smallest chance is your 3rd member.

flex disc(s) center carrier bearing on the driveshaft?

Note: Rear
Rear torsion bar To trailing arm.

L1030-16059 Sway Bar Link Lemforder IN STOCK $10.

These will do it, order two they take 10 minutes to change. All you need are a few open end wrench's.

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1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200

While it is the sway bar links on your car, on mine the entire rear window thumps and bangs in the body.

I really need new rubber.

Michael

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Usta haves '69 250/8, '76 280C, 1971 250C 114.023, 1976 450SEL 116.033
Current have, 1983 300SD 126.120

How did you guys settle on sway bar mounts when he did not mention the noise being associated with bumps in the road ?... A CV joint can make those types of noise on level smooth ground.... have never seen a sway bar do that.

it could also be rear subframe mounting bushings. they will make a very loud clunk/bang, when shifting, will also make it seem to shift hard. new repair kits can be had for between $110-$140 each.