NORCAL SS, are you still monitoring this thread? I'm new on this forum, and just bought my 2008 Avalanche about a week ago. I had a 97 GMC truck for 13 years that was lowered and I loved it. I would have kept it forever, but a 16 year old girl lost control and hit me head-on 3 years ago totaling my truck. Since then, I've had a 2007 Suburban that I just sold today. I always wanted to lower it, but couldn't justify it with my wife. Now, I'll have some money leftover from the sale, and want to lower my "new" Avalanche. It sounds like you're the guy to ask for advice, and possibly buy the kit from.
My Avalanche is 4WD, LTZ with aftermarket 20 inch wheels. I will probably eventually change the wheels as these are starting to pit, but I will most likely stick with 20's. I actually powder-coated my black Suburban wheels black and it looked great, but I don't know if I would like the black wheels as much on my white Avalanche. Do you have instructions, advice, or sell a kit to bring my Avalanche down 2/3? I would post pictures, but I don't see a option for that. I probably need to be on here longer.
Thanks, John