Jeffrey:
The most common cause of a vibration is tire balance or a bent rim. However, that wouldn cause the noise you hear. Does the grinding sound happen at all speeds? Have you checked brakes? Does the sound change under different conditions such as braking, turning? Since you had the tie rod replaced and the alignment, has the vibration gone away?
Let me know.
Joe
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Wednesday, February 3rd, 2010 AT 1:44 PM