I have the AC lift w/upper a-arms, and noticed a few weeks ago that both forward a-arm bushings were split. I called AC and Mike sent me new ones fast&free. To make a long story short, the forward upper a-arm cam bolt can easily be overtighted when being aligned. This pinches the mount inward (you can actually move them with very little force i.e. large screwdriver). When it pinches the bushing it crushes the inner metal sleeves,in effect binding them ,this also splits the poly bushing. One set of sleeves was seriously grooved from this binding. I guess my advice is to advise whoever aligns it that they not exceed the 100lbs/ft factory recommendation. If they just torque the hell out of em your going to have problems.