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So I have had a vibration of some sort from day one brand new on the highway. I didn't notice it on the test drive, but noticed within the first week it had a vibration at speed. The dealership in a few attempts failed at fixing it. A second dealer tried unsuccessfully as well. They went thru the whole drive line. Tires come up as ok. I switched wheels and tires and still had a vibration that starts at about 60- 65 mph. I road force balanced to no avail. I currently have balance beads and they work well and will always adapt to tire wear which is advantageous. Regular weights will be incorrect at some point during the tire wear process. Is what it is. Anyways I got to talking to a tech and he starts talking Nervous Chassis to me. It made sense that a pick up truck is very front biased in terms of weight and is unstable by design in general. This is the template that trucks are built on so this the result. It is more evident in some trucks more than others. He says put weight in the front of the box. Couple hundred pounds if possible he says. I put 210 lbs. by way of 3 sand tubes and a board in the bed slot to keep them located. I hit the highway and low and behold I could go to 70 mph before I felt a vibration. I can do highway speeds around here locally. (55-65) with a smooth ride now. I run 10 ply tires and found that they can be a comfy tire soaking up road chatter at 40-45 psi, but this creates an issue at highway speeds. The tire can distort while spinning if it's too soft and cause vibrations. I stiffened everything to 47 psi cold in the rear and 52 psi cold in the front. This made a positive change and I can drive 75 mph smooth as glass now. I ran up to 80 briefly and felt a very slight vibration. I can travel as fast as I need to now. This truck is so damn smooth now, especially with the buttery TCM tune I have to top it off. I have found Nirvana, finally.
