A 4in bolt-on lift system that clears 37in. tall tires? This is it! Destined to become the new standard in 4in systems, the new Jeep JK Wrangler Ultimate 4in system from Full-Traction is the most feature-laden kit available for both the 2-Dr and 4-Dr Unlimited models. Combining all the necessary components together in a 100% bolt-on package, this system will allow use of 37in. tires with ease, superior flexibility, and complete wheelbase and pinion angle adjustability. Re-buildable, fully adjustable lower control arms are manufactured from durable 2in. x .250in wall DOM steel tubing and use the same 4130 Cromoly Heim Joints used in our famous Long Arm systems. You can not find a stronger, better performing arm at any price. Quality, laser crafted components allow proper fitment to make this system the one to choose for JK-ers demanding the best.System comes complete with 8 adjustable upper & lower control arms for both front and rear, heavy duty adjustable front & rear track bars, track bar drop brackets, Pitman Arm, new generation front sway bar disconnects, rear links, bump stops, brake line relocation brackets, and ride frequency tuned coil springs for a comfortable ride. Available with either Full-Traction Twin Tube Hydraulic shocks or M-Force Performance Gas Monotube shocks.