I had just gotten off the interstate the first time this happened. Thought it was u-joints but dont think so. When i hit the gas i would get shutter/vibration from the rear end. It then stopped. Now it does it whenever i take off from a stop turning. It gets worse if i spin the tires and then it goes right back to the way it was. One time it did it so bad i barely moved when i pressed the gas. Im pretty worried about it. Any help is greatly appreciated.