I've been chasing this knock in the front end for 2 weeks. Can't seem to find anything loose. You can feel in it the floor on the passenger side. Trac bar is a new moog unit, maybe the bushing is bad already? All new tie rod ends, new pitman arm, new sway bar end links, ball joints are tight, wheel bearings tight, u joints are tight. Shocks were replaced by PO maybe upper bushing isn't in there or possibly sway bar bushings on the frame are worn out I can't physically shake or move anything. Really scratching my head here. Only feel/hear it when I hit a bump. Appreciate any other ideas on areas to look at.