Rough Country includes 4 Weld-on Spring Pads to accomplish 5.5" of lift on the Jeep Wrangler YJ with the factory springs. Depending on the level of performance you're looking for, more components may be required. This spring over axle (SOA) kit does require welding, therefore it is recommended to have this kit installed by a professional welder. The SOA kit is designed to move the leaf springs from the bottom of the axle to the top effectively giving lift to the vehicle and flexibility with the use of the stock springs. Allows 35x12.50 tires.