If it sounds like "off road tires" I would check the tires first, there might be some clues there. Did the off road tire noise and the shudder start at the same time ?? I just had some serious noise coming from the front of my E70 that was just cupped and crappy tires.

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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)