[gilbertma]

I wasn't sure what spacer to use when I put mine together so I temporary installed the airbag with the upper bracket and laid the lower bracket on the leaf spring, then measured the space and 3" seemed the best choice and has worked out good. In the picture above I have about 20 psi of air in the bag, if I let the air out it will compress a little less than an inch, if I put 100 psi in it will lift the truck a little over 2". I have a Belltech flip kit that mounts the leaf right under the axle and lowers 6", a short lift shackle is supposed to bring you up to 5" of drop but I think I ended up around 5.5". When I keep about 15-20 psi in the bags it raises me up a 1/2-3/4" to a 5" drop. Anything more than 5" and you will banging those bump stops constantly.