Help, Ticking noise at hwy speed, 2001 4x4 will tick at 80 kph and above. the noise sounds like a rock in the tire but not so lucky. pretty sure it is a driveline noise because it doesnt speed up or slow down with rpm, only with speed. Has all brand new u joints and well greased, new wheel bearings in rear axle. The noise has been driving me crazy for about a month now, hasn't gotten any louder and is most noticible with windows down and a hwy barrier on the side. Any help would be great. thanks.