Josh...what wheels/tires/ backspacing do you have. Just installed 3" shackles and now have 6" axle to frame, so my Airlift bags won't work. I've contacted Airlift, PacBrake and Firestone. I gave them all my measurements and all they can say is " we make a kit for stock height only ". So much for tech help, what a complete waste of time.
You need something like this scroll downVVVVV
http://www.duramaxdiesels.com/forum/showthread.php?t=32942&page=39