Take a good look under your new Chevy. I just met with the GM service rep for NC and he told me that Chevy choses not to paint steering and suspension parts on new Chevy and GMC trucks.
He went on to say that GM would not customize my new 07 truck to prevent the parts form rusting.
Make sure you get your new Chevy customized before you buy it or better yet buy another brand.
They do not paint:
The engine block