Uhm, rancho does not produce a 3" lift for sammies, but trailmaster does. You can do what you are asking but you will encounter some problems to overcome. 8" of lift will give your steering ,bad bumpsteer. Driveline angle will be too much for stock ujoints and cause severe vibration and drivelines will be too short. It will be rather tall and more unstable on and off the road.