my wife noticed a vibration coming from the rear end of the truck when its decelerating and coasting at low speeds (under 35 mph), just put new tires on but dont think thats the problem as its not a constant shake, im not in the us to diagnose the problem my self but its only a shake from the rear and no whine or squeal like if you pinion comes out of spacing or a u joint goes bad truck has roughly 30,000 miles on it, any ideas would help so i dont come home to a major problem that involves shop work from Afghanistan