I have Z71 springs on the rear which lifts it 2" and then just 2"-3" keys on the front. Rear sits at 39" to the center of the rear fenders and the fronts at 38 1/2" I could go up to 39" on the front, but for whatever reason like on most of these trucks the drivers side torsion is almost maxed out, and the passenger is only like half way. So I didn't way to max out the drivers side for an extra 1/2 inch. You could also do 2" spacers on the rear, I just had trouble fitting them in when I tired to do spacers so I just said screw it and bought springs off RockAuto.com for like $50. Same price as spacers and went right in, no prob. But if he still has the factory autoride hooked up, I'm not real sure how you have to go about doing it. You'd have to do some research on here, but I know it can be done.