Did the "free" 1/2 drop on my truck yesterday. I include the "" because its not exactly free since I paid about $50 for the shorter U-Bolts from GMPartsDirect.com (Part #15002781). I pulled the rear 2" blocks and did 7 full turns (actually 14 half turns) to drop the front end down an inch.
I didn't realize how sensitive the pics are to showing the drop but there is definitely a difference now.
Stock
Rear Dropped 2" Only
Complete 1/2 Drop
Some other shots...
The Install went very quick and was very easy to do. I am pleased with the results. Got it aligned correctly today and it drives great!
For better instructions on how to do the drop look at post #6 here