So, after hours of reading this from at least page 300 to current, I still have some questions.
I want to get some leveling on my 2017 Sierra. I also want to keep the 22" factory wheels. I called Rough Country and they told me if I run the 2.5" kit that I had to run 2" wheel spacers to use the factory wheels. I called ReadyLift, and they told me if I get the 2.25" kit with new control arms, that I had to run a 1/2" wheel spacer to keep my factory wheels. I can't seem to find a lot of people mentioning the need for spacers just to keep their factory wheels.
I'm leaning more toward the ReadyLift kit, and getting some 2.25" or 3" rear blocks, and I'm also going to up the tire size from 285/45R22 to something like a 285/55R22 or a 305/45R22. I just want to know if anyone else has done something similar, what the results were and if I really need to run a wheel spacer just to keep my stock wheels.