I had exactly the same issue with mine ,although I installed strange 10 way single adjustable fronts and rears. After about a week the clunking started on the passenger side rear. I tightened every bolt again on all suspension parts and the axle backs. Turns out I put the shock's on the opposite sides. The problem moved to the other side and confirmed it was a bad shock. Now I am looking for a different brand of 10 way adj. rear shocks. Looking for recommendation????