mechanic checked tranny fluid, it was full and red. Checked what he could of the balancer and it seemed ok. Thing is this particular vibration may in fact be torque converter related, because it only vibrates radically in gears, never in neutral and you can barely hear the engine idle. Tomorrow, it goes to European Auto Service in Atlanta. I'll keep you posted.

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X5 3.0 AUTO -2001 - 238,000 miles