Here's the problem with adding bushings to the stock lower arms. The oval bushings found in the stockers don't rotate like the round ones found in aftermarket arms do. When the rubber bushings are in there the ride is compliant and although it's inconsistent, the
suspension still transfers because the bushings have a lot of give to them. When you change them out with urethane bushings, you not only lose that ride compliance, but since they don't deflect like rubber bushings, they bind. Actually makes them worse performing than stock, not better.