Anybody got any ideas on what might be causing my Jimmy to vibrate like a paint shaker at highway speeds (55 - 70). You can see the vibration in the steering wheel, but I think I can feel it through the rear floorboard too. I have replaced all of my rod ends, all of my u-joints, had the wheels inspected and balanced, but none of this has eliminated the vibration. The tires I am running on the street are 33X12.50x15 BFG AT's which is not a gnarly tread pattern at all, so I don't think it is the tires. I have considered that it might be either the wheel bearings (no noticable noise) or the driveshaft(s) (no noticable dents or damage and the weights are still there). There is no play in the tire/wheel when I lift the tires off the ground either, so I don't think it is the ball joints. But then again, it could be any one of these things, a combination of the three or none of them at all, I am just not sure. Anybody with some insight on what might be my problem?