Switch the tires front to back and see if the vibration moves to the front of the truck.
If so, it's the wheels, cracked welding can cause harmonic vibrations as high rotations.
If not, it's either the bearings or the rear end.
Since you say this problem started after the rear end change, I'd have them open the cover and check the spider and planetary gears and see if there are shavings in the oil back there.
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Monday, June 4th, 2007 AT 12:18 AM