Pretty common. The LCA isn't "worn out". It was just built that way. (sloppy) Those two pieces don't move independently from each other once the ride height it set. My Dart LCA was the same way. I welded a small strap to the back side to tighten things up. Not sure that it actually does much of anything but it made me feel better. Once there is a load on the LCA from the torsion bars and the strut rod is installed, my guess is that movement will go away.