My '02 Explorer has developed an clicking sound in the rear end of the vehicle. The best way I can describe the sound is that it sounds like turning a child-proof medicine bottle top without pressing down on it. The noise is intermittent and can be heard both when braking or driving at a constant speed. (I think I may notice it more when braking because of less ambient noise.) It doesn't seem to be related to any one action (acceleration, deceleration, transmission shifting, etc.) and I haven't noticed any change in vehicle performance. Has anyone else had this problem or know of what could be causing this?
Thanks in advance, Joe