I have noticed lately that around 65mph I am getting a vibration and it seems to intensify with speed. Acts very much like a bad universal joint.If you let off on the power it subsides. There is no front end movement and it seems to have come on suddenly or maybe it was very subtle and I didn't notice it. The Jeep spent a day last week at the stealer's and they said that they drove it and saw what I see. They checked under the vehicle and"didn't see anything apparent" so they balanced the tires and test drove it to find no difference. I have to leave it again next Tuesday and we'll see what happens. I only have 42K easy miles. Other than the common shifter bezel problem , I have had no trouble and I love the Jeep! Any ideas?