Dude I saw a bad ass SAS set up here where I live, if I can catch the guy again. I'm gonna refer him to here. He bought the truck from a guy in Utah, who did a SAS front and rear, I believe he told me a Dana 40 up front and Dana 60 in the rear (8 lug FOrd I believe) , plus it had 4" shackle lift... I think he said around 8" or so lift, seemed higher to me. He was running Toyo 37's on 20" Black Rockstar rims.... It was a white Tahoe, 98 or 99 (2 Door). BAD ASS!
I'll see if I can find him and get him to post some pics...