This Zone Offroad 4-link system replaces the weak upper and lower factory control arms with greasable DOM tubular arms. the arms mount in the factory control arm pockets for a completely bolt on easy installation that aligns to factory specs. Zone Offroad has engineered their coil springs for a comfortable ride on both gas and diesel trucks. To correct the steering geometry and keep your axle centered, the kit includes a dropped pitman arm and 1/4" thick fabricated track bar bracket that you will not be disappointed with! The kit also includes sway bar drop brackets and if you get serious, taller bump stops. The rear is lifted with 3" blocks to give your truck a more level stance and make for a quick installation.