Here is the exact results given to me by the dealer.

Front undercover hitting brace/creaking/popping in front and steering stops dry, center vehicle cross members creaking/popping with vehicle flex, transmission electrical connectors scraping against tunnel under car,

right rear body mount creak/pop/ with sudden braking-bend/adjust front under cover (skidplate) for clearance and lube steering stops, loose lube and retighten 2 cross members at both ends, re-reoute and secure electrical connectors on trans to clear the tunnel. Tighten 2 rear body mounts.


That was what was needed to fix that clunk. Hope it helps anyone else with the noise.