Control Arms Whether aftermarket or stock control arms, inspect the bushings, check the arms for rock rash, and sight down them for any warping or bending as if you are buying a piece of high-end hardwood. If the control arms are adjustable, place them on a flat surface and make sure that the ends are true and square with each other. If they aren’t, it is possible they were set wrong and one or both bushings could be worn prematurely. It can also be a sign of a bent arm. Rubicon Express joints, Johnny Joints, and all similar ball-and-socket joints should be difficult to move by hand. If they are loose, grind, or make funny noises, a joint replacement could be in your future. But beware—some of the older versions no longer have parts available for rebuild which can leave you up the proverbial creek.