thanks folks...couple of good ideas thus far.

pretty sure I checked the sway bar bushing bracket bolts...put a wrench on them, at least some of them. Possible some of those bolts are blocked by the transmission undertray which I definitely didn't remove when I checked things out. Will look again.

I have not checked the shock top nuts. I recall torquing those suckers good when I did the install, but its worth a look.