At highway speeds above 60 mph on a smooth road, the vehicle runs fine. But if the road has any bumps at all, even small ones, it starts to vibrate very fast as long as there are bumps. The steering wheel almost becomes a blur. It’s like it’s going into oscillation.
The wheels have been balanced and rotated. The movement the steering wheel is not side to side, like I have experienced with imbalanced wheels.
The shocks look fine and I am told that they are OK by the tire dealer . I have never had this kind of a problem with bad shocks. The vibration is just too rapid.
Before I take the truck in for the mechanic to inspect it, I would like to hear some ideas as to what the problem might be.