There are two different types of lift systems for these trucks, a knuckle kit or a full control arm drop kit. The knuckle kits (rancho, fabtech, zone, cognito, superlift FIT, RCX) are easier to install but will increase the front track width (distance between the front tires) where the full drop kit (pro comp, superlift bracket, ) will stay at the factory location. I've had really good luck with the 6" pro comp kit if you wanna go a bit higher I'd recommend the cognito kit as they're worth the extra money for a solid system with the pitman/idler reinforcements.