Like stated above, it will depend on how you mount them. That being said, I mounted some in the rear of my '91 Crewcab and used the stock style rear shackle. I moved the front spring mount forward because i wanted to keep the axle in the stock location. When it was all done it lifted the rear right at 1". I had a lot of flat frame rail to work with though and i had to relocate my saddle tanks.