2003 Mercedes Benz Other

Suspension problem
2003 Other Mercedes Benz Models 6 cyl Two Wheel Drive Automatic 58000 miles

When driving at highway speed (55+) I can feel a slight shimmy through the steering wheel. Also any sort of " bump" (protrusion in the road, etc.) That is driven over on the left front side causes a loud clang, but only a thud on the right side. I have had 2 alignments, new front brakes, rotated tires, replace loose right front ball joint, but the problem persists. Can you point me in the right direction?
July 14, 2008.

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