Just got my hands on the three volume set (paper)—a friend who works at a local GMC dealer came across them, new in a box untouched.
Since I'm new here, and have learned quite a bit about my new toy reading the forum, I'd like to contribute (and maybe build some goodwill since I assume at some point I will say or do something that annoys 75% of you):

If anyone is in need of repair info specific to the 2009 model year, feel free to hit me up and I will scan the chapter you need. I know Schwarttzy has almost everything archived on his website (and it's been very helpful) but it seems his PDFs are from 2007/2008.

I can't promise requests will be fulfilled immediately or even within 24 hours as I seem to always be working—but they will be fulfilled nonetheless.

If I ever have, ohhh, a month of free time, I'll eventually scan everything and stick them somewhere on the internet. Chances of that are…

 

That's great!
There are many differences after the 2008 model year.
One of them is the locking front differential.

 

Volume 1, Chapter 7 to be exact…a major reason I got 'em.