This 4 inch WJ system offers dramatic improvement in both ground clearance as well as wheel travel. The new massive lower control arms not only correct front alignment, but dramatically improve suspension control. The zone control arms feature fluted greasable urethane bushings for ease of movement and long term performance. This system comes with a small transfer case drop to correct driveline angles. A heavy duty front adjustable track bar is used to center the front axle. The rear is corrected via a tri-link spacer. With 4 inches of lift, you can clear those 31's with room to twist as well as use your Jeep for a daily driver.