I would check all the rubber pieces in your suspension and the rear links/arms. Do a "search" in your right upper corner on this screen on rear suspension. Struts/shocks in MB's last a long time, rubber pieces do not. One more thing check your tires air pressure. All these things WILL make a difference. DO NOT go to MIDAS or the dealer. Go to good MB independent. Good luck!

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J.H.
'86 300E