Got a 2004 off road ranger, 60,000 miles. Its got a vibration which starts about 55 mph. It drumbs the cab making it hard to hear the radio. Its a high speed vibration. Hanging on to the steering wheel feels like hanging on to the handle bars of a cheap motorcycle. Smooth as glass up to 55mph. Got new tires too. A friend said it felt like it was in 4 wheel drive. Is the front drive shaft supposed to turn when it's not in 4 wheel drive? It turns. I had an earlier model with automatic hubs that would release the front drive system in 2 wheel drive. Not sure about this one. The rear drive system looks like new.