As stated, I have rebuilt many lower control arms. I have found varying degrees of slop, which I believe MIGHT cause the clunk sometimes heard when turning while backing. I don't have any proof of this, but there's really no reason not to limit the slop. Interestingly enough the LCAs from our GTS convertible are among the least sloppy I have seen. This is a car with around 155,000 miles so it doesn't necessarily seem to be a wear problem, but a manufacturing problem.
