What kind of lift depends on what you are using it for, and what model this truck is. (You didn't specify what model your truck is.)(I'll assume it is a Full Size Jeep (FSJ).) Will this truck see rocks or serious loose dirt? If not, and all it'll see is beach and pavement, you might want to consider a body lift. Either 3", or 2" and longer spring shackels. If it'll see rocks, sand dunes (desert), or some nasty dirt roads, consider a 3" lift that replaces the entire spring pack. (Or get wild, and go 5".) And bigger tires.