02 suburban lift problems

I have an 02 Chevy Suburban z71. I have been looking into lifts for it and have run into some problems. i would like about 4in, but all of the suspension kits, and I have looked at a lot, seem to require trimming/cutting the frame adn or hacking a large part of the differential off. however i have found coil spring spacers which can give 3in of lift for much cheaper. What is the draw back to these spacers? I have heard that the only real issue is that cv boots wear easier. Are there any kit out there which are purely bolt on? Please help!