I owned a 2009 Silverado extended cab and it made that same sound since brand new. I put 150,000 miles on that truck and never had any problems with drive shaft or u joints. Was told at the dealership when I went in for the 1st oil change that it was normal and all the new vehicles do it.
Don't leave a fish to find a fish!!! Mark Zona
For the love of god man, set the hook!!! Me