Complete partial hydraulic steering system for Jeep Wrangler JK 12-18 (4-door), 3.6L Pentastar halves the force acting on the steering gear. All components are screwed together, no welding necessary. Ideal for driving with larger wheels. The system consists of: steering gear, hydraulic cylinder, joint eyes, axle holder, all required hoses including fittings, PSC high-performance pump, belt pulley, compensation tank with inlet filter and compensation tank holder. We recommend using special power steering oil for the PSC high-performance pumps: Swepco 715 or KSE Elixer