I'm running them on my rig. It lifts the front or the rear 1" and you have the option to push the axle forward or backward for a better approach angle. Bolts straight to the spring pack and you'll 1" longer ubolts. Alot just put them in the back to fix the sagging but look but I just put one in the front to move my axle out. My K5 doesn't sag in the rear but thats prob because I don't run a top, doors or tailgate.