Hi Toptoy,
If the vibration is occurring only when making slow speed turns, it is due to the rear differentials. Get the fluids replaced and retest.
If vibration is occurring only when moving forward and within a certain speed range it is more pronounced, the propeller shaft U joints are bad and shaft has to be replaced, unless the U-joints can be replaced by a machine shop.
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Wednesday, November 3rd, 2010 AT 11:42 AM