A cople things come to mind on this, the torque converter may have lost a weight if it takes one, crank bearing could be worn, causing to much end play in the crank or if it has a bearing/bushing for the torque converter that may be worn. Normally it's a balance type problem that causes this. If it's had recent transmission work it could be the worng converter.
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Monday, February 27th, 2012 AT 8:28 PM