Not sure. Did not notice it after truck came out of storage for the season or after first trip of the year. It was noticed after it sat around for a period before a second trip. Thats when the ball joints were suspected by a mechanic. After pulling the steering stabilizer and reinstalling coincidently - no apparent noise. Long trip no noise. After 1 week in drive - noise.

Will be back looking at it later this morning. Unfortunately no Indy shops nearby.