A Lift kit is practically a kit that contains the parts needed to lift a specific vehicle model, and instructions on how to do so as well. The contents of the package depend on the model – some kits only contain parts that are difficult to obtain otherwise (generic hardware can be used to complete the lift), while others include a variety of parts, like new suspension, drivetrain parts, drive shafts, etc.
http://www.allsuspensions.com/....suspension-lift-kits