I just had my truck out on a road trip which involved alot of miles on dirt roads that varied in terrain from good to bad, any way on the way home driving the highways I noticed every bump I hit I felt some sort of knocking noise under the drivers feet. When I stopped for feul I checked the front shock mounts thinking it was a loose stud or something but they were both nice and snug. Well I started to move the truck up and down on the front bumper and I could slightly hear the noise coming from the front drivers side so I got underneath the truck and had a friend start rocking the truck up and down and I put my hand on the track bar and I could feel it making a thunk kind of noise as the suspension traveled up and down, then I noticed a little bite of movement on the ball joint end of the track bar as the truck rocked back and forth. So my question is, is this normal or should I start thinking about replacing my trac bar? 
