Why does my 1989 shake violently when I go over a bump in the road on 1990 Mercedes-Benz 420SEL

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I've had a wheel alignment and balancing. It does fine at speeds so far up to 70mph. but hit a bump or pothole and it shakes terribly.
(2) Answers
(3) Comments
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I would suggest to have the alignment double checked making sure the caster setting is correct.
Thank you!! How much should the repair for a steering dampner cost? Will I damage my car if I drive it for about two weeks?
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