You’ve got a four wheel drive pickup and you want to install a suspension lift kit. Adding a suspension lift kit will increase the ground clearance under the truck, allowing you to go over larger obstacles without getting stuck or breaking parts. A high quality kit that is properly assembled will come with everything that is needed for the installation. Except maybe larger shock absorbers with increased travel. Poorly assembled kits will require new front springs. Some lift kits will require larger wheels and tires. Most lift kits will require extensive cutting and drilling for proper fitting.