Rock Krawler JL45XF-4D 4.5 Inch X Factor Mid-Arm Lift Kit Jeep Wrangler JLU 4-Door

The Rock Krawler JL45XF-4D 4.5 Inch X Factor Mid-Arm System is a complete front and rear lift kit engineered for the 2018 and newer Jeep Wrangler JLU 4-Door. Designed for Sport and Sahara owners who demand a full bolt-in installation with maximum articulation and proven off-road durability, this system delivers 4.5 inches of lift and the geometry corrections needed to run large tires without compromising on-road handling.

At the heart of the X Factor system are Rock Krawler's signature adjustable upper and lower control arms, offering up to 90 degrees of total misalignment to eliminate the bind inherent in the factory JL control arms. High-misalignment adjustable uppers allow precision caster tuning both front and rear, while the triple-rate coil springs provide an on-road ride quality that surpasses the factory linear-rate springs. The coils are built with the proper free-length for full off-road articulation and remain securely seated in the coil bucket throughout all terrain conditions.

Key Features:

• 4.5 inches of lift — accommodates up to 42-inch tires depending on model and configuration
• X Factor Series adjustable control arms — up to 90 degrees of misalignment, drastically reducing factory JL bind
• Adjustable upper control arms — precision caster and pinion angle tuning front and rear
• Triple-rate coil springs — all four coils deliver superior on-road comfort over OEM linear-rate springs
• Track bar geometry corrections — front and rear corrections to perfectly center the axles for optimal handling
• Correction pads included — reduce spring bow inherent in the factory setup
• Complete bolt-in installation — no cutting or fabrication required
• Fits 2018–Present Jeep Wrangler JLU 4-Door (Gas Models)

Rock Krawler's comprehensive approach to suspension geometry means the JL45XF-4D addresses factory shortcomings from the coils to the control arms, delivering a system that performs confidently on the street, in tow, and on the trail.