Installed new shocks, re-tightend everything. only thing i found a tab loose was upper rear control arm bolts. test drove truck after re-installing unit hub bearing due to dynatrac bearing failure and it still makes the noise from time to time... it sounds like a loose caliper rattle, only when hitting moderate bumps. you have to have windows down to hear it. Any other thoughts? I'm going to take the track bar out again, to re-examine bushings and lock nut. . everything appears to be tight. . it is real mystery to me.