JKS JSPEC4000 Suspension Control Arm Kit

When the JKS engineering team set out to develop a long arm system for the Jeep JL, the mission was clear—create a suspension that delivers exceptional on-road manners without sacrificing off-road performance. The result is a thoroughly refined system built from real-world customer feedback, extensive testing, and a relentless focus on performance, durability, and quality. This isn’t just a lift kit—it’s a complete suspension solution for Jeep owners who demand the best of both worlds.

Proudly made in the USA, this system features true long arm geometry with heavy-duty 2-inch diameter control arms, adjustable track bars, and precision-engineered brackets designed to maximize both strength and ground clearance. Every component works together to provide predictable handling, excellent high-speed drivability, and impressive articulation on the trail.

On the road, performance is achieved through a refined 4-link geometry with track bars, optimized control arm length, and a carefully balanced joint and bushing design. This results in a smooth, controlled ride with confident handling at highway speeds. Off-road, the system is engineered to reduce the binding commonly found in 5-link systems, allowing the suspension to cycle freely and maintain traction across uneven terrain. Carefully tuned anti-dive and anti-squat geometry further enhance stability under braking and acceleration, delivering a balanced driving experience in any environment.

Ground clearance is a key focus throughout the design. All frame brackets are engineered to sit above the bottom of the frame rails, ensuring nothing hangs down to catch on rocks or obstacles. The system maintains a smooth underside profile with no exposed bolts or plates below the frame. High-clearance rear axle brackets and replacement control arm mounts improve both geometry and trail capability, while a replacement crossmember doubles as a control arm mount without sacrificing clearance. Every detail is designe

Features

• Heavy Duty long arms - Built from JKS 2-inch steel tubes with custom designed control arm bushings for Maximum durability.

Definition: Suspension Control Arm Kit