I have had the same problem for 5 yrs also. What tires are you running? Mine did it, I replaced the tires and it went away for about a year and then the noise started back up. I have the wrangler rts on there now but I'm going to change to Revo's soon. Check you alignment also, my truck has way to much neg camber and the inside edge of the tires is really worn. I really think it has something to do witht he tires being that it went away for a year after I put a new set on.