I was driving the Raider from the exhaust shop today (guy wants $150 for a cat back system <img src="/forums/images/graemlins/kewl.gif" alt="" />). But I was noticing on the ride there and back, at slower speeds the Raider would have a noticeable vibration. between 15-25 mph the vibration is almost unbearable. 30-60 the vibration goes away, but could be felt by holding onto the transfer case shifter. I have a feeling that since it started right after I installed the Valley coils that the old Ujoints are worn into the pattern of the old springs. After I get the exhaust installed I will throw in the new joints and report back. <img src="/forums/images/graemlins/kewl.gif" alt="" /> <img src="/forums/images/graemlins/kewl.gif" alt="" />