Originally Posted by ABYSS
I have investigated the poly bush for upper wishbone. However I noticed the the little ball joint will wear out much quicker than wishbone bush. I believe most of the knocking noise is caused by this ball joint failure.
Agreed, I'm not sure it's worth polybushing them. Most common problems seem to be squeeks from the top wishbones. A healthy spray of silicon seems to resolve most problems as they dry out.