Rancho is proud to offer a new 3-3.5-in. Suspension System for the Jeep Wrangler JK. The 3-3.5-in. Suspension Progressive Sport Kit features front & rear variable rate coil springs to provide superior on road comfort and off-road performance, adjustable front trackbar to center the axle and rear trackbar bracket, extended sway bar links, front stainless steel braided brake lines and rear brake line brackets, and front bump stops. This kit is precision engineered to be 100-percent compatible with the Jeep factory electronic stability system. The kit was designed with 35-in. tires and 17-in. wheels with 4.5-in. of backspacing.