Hello all, I have an 08 DC 4x4, with the 5.7, I have now got about 30K miles on her and recently I have noticed that I have a distict vibration felt in the steering wheel. It is most noticeable at highway speeds it is a constant buzzing type feeling, if you turn slightly to left or right while at the speeds it is even more noticeable and with your hand on the bottom of the steering wheel. I have had my tires road force balanced, front end alignment checked. I just don't know what to do. The vibration can be felt at lower speeds also but is most noticeable at highways speeds (65 - 70). Has any one else on here experienced this?