Hi Guys, I'm new to the form. Recently purchased a used 2005 Jeep Liberty 3.7. noted knocking and clunk from the differential area since I bought it. Initially I thought it was the u-joints, therefore I replaced both of them however still the clunk was there. I looked above the differential and their appear to be a control arm which I never even knew existed. A use the pry bar and the ball joint was very loose and made a clunking noise. Today I was able to remove the rear control arm however I was having a hard time installing the driver side control arm bushing bolt, first it was not going through the bushing itself however I noted the captive nUt that is supposed to be housed in the frame was loose and is spining on its own. I'm not sure what to do now. There's no way I can even see you why the nut is spinning. I can't even hold it with anything. What are my options?