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Specialities include: Automotive Mechanic, Small Engine Repairs, Auto Body Repairs, Diesel Engine Repairs
Hello and welcome to Just answer.com, Super mechanic here. Please DON’T hit accept until you are completely satisfied with the answer. About your vehicle.
There may be an imbalance in the driveshaft or U-joints. You will want to have the driveshaft balance checked. Normally a drive line specialty shop can do that.
Also, the center support bearing, (which I would think they already did check)
CAUTION: To preserve 'drive line' refinement, individual parts, other than fixings, MUST NOT be renewed. In the event of any balance or driveshaft component related concern, the complete assembly must be renewed. Under no circumstances may the flexible coupling be removed from the driveshaft (or its fixings be loosened). Do not drop or subject the driveshaft to damage.
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Ellen
Licensed mechanics