control arm moves foreward and rearward slightly and sounds bad. I had about 6 or 7 different noises coming from my rear end. I converted to coilovers, installed new bushings, insalled new struts and all the noises went away. Also check the big nut on top of your strut housing. The one that keeps the strut in place. If it is loose it will sound bad.
Your halfshafts could also be loose and that would make a noise.