Originally Posted by Weasel

The bushing ends of those control arms are solid rubber, the ball socket end wears first oddly enough. And the lower ball joints are kinda sideways compared to most, so they don't really cause clunking or knocking. But they can cause a squeak.

I'd go for the upper control arms first as they are the main wear item back there. They can be confirmed with a good shakedown, but you dno't really feel the movement when shaking the tire... you gotta have someone shaking the tire for you while you monitor the joint.