Drive line noise mystery? Solved

[Chamberpains]

Thats a terrific idea hhow55. Thank you. I should've put that in my post as an alternative or a first resort.
A dyno is great and safer if you have access to one. Plus you can chain them tight to put pressure on the wheels like there is a load on. It would probably find his noise faster. If the dyno shop lets him climb all over the truck while its in motion. I would go this route if you have access to one. I never had access to one when I was a wrench.