I just went to 37's ko2 a few months ago. The first day I had them no problems and the ride was awesome. After that I started to feel a little vibration in the seat and wheel, took it back to Discount tire and had them re-balanced, took it for a ride and it didn't go away. I went through the jeep inspecting and checking every bolt I could and everything was tight so we thought it had to be the wheels them self. Discount put new ones on this past Friday and I still have the vibration in the wheel. You can really feel it at 40 and above. Ball Joints, drive shafts, seals are all new or within a year. Looking for some ideas on what it can be.