Crawled under the truck and stared at things awhile today. I was sure the clunk was coming from my Bilstien shocks since it had initially gone away when I installed them 8 months ago. Nope. Found that the idiot kid at Les Schwab had left the tie rod clamp rotated so it bumped against the crossmember when he set up the toe in (same kid who told me caster was not adjustable). Anyhow, a little twisting on a wrench and its much quieter now. I still have a noise that is more like a groan that I get while turning the steering wheel. I'll have to keep looking... ...