If I understand you correctly, you changed the ball joint. Did you replace one side or both? It seems obvious to me that after you changed the ball joint, a severe vibration resulted.
I'd recheck your work to see that every suspension component is attached correctly and that the ball-joint is also correctly installed.
If you didn't do it, take it back to the shop immediately.
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Paul S.
2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.
1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".
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