Rock Krawler JL45XF-4XES1 4.5 Inch X Factor Mid-Arm Suspension System Stage 1 - Jeep Wrangler JL 4XE

The Rock Krawler JL45XF-4XES1 4.5-Inch X Factor Mid-Arm System – Stage 1 is a complete, bolt-in suspension lift kit engineered specifically for Jeep Wrangler JL 4XE models. Designed to deliver maximum articulation from a mid-arm platform, this system combines precision geometry, industry-leading control arm technology, and Rock Krawler's proven triple-rate coil springs to elevate both on-road comfort and off-road performance.

X-Factor Series Control Arms:

• Adjustable upper and lower control arms offer a total of 95 degrees of misalignment when paired with Pro-X Krawler Joints and Adventure Series joints
• Maintenance-free Adventure Series joints at the frame connections front and rear
• PRO Krawler Joints at all axle connections for maximum strength and articulation
• Significantly reduces the inherent bind found in factory JL control arms
• Full adjustability allows precision tuning of caster and pinion angle, front and rear

Triple-Rate Coil Springs:

• Industry-leading triple-rate coil design delivers 4.5 inches of lift
• Built with the correct free-length for optimal off-road articulation while staying firmly seated in the coil bucket
• All four coils work together to provide on-road comfort that surpasses factory linear-rate springs
• Controlled, predictable response over rocks, sand, mud, and varying terrain

Geometry Correction & Hardware:

• Includes correction pads that reduce the spring bow inherent in the factory JL setup
• Front and rear track bar geometry corrections to perfectly center both axles
• Proper axle centering ensures no compromise in on-road handling or steering feel

Shock Specifications (Stage 1 IFP Shocks):

• Generic front shock length: 18–19 inches collapsed / 31 inches maximum extended
• Generic rear shock length: 19 inches collapsed
• Stage 1 includes IFP (Internal Floating Piston) shock absorbers

Tire & Wheel Fitment Notes:

• Sport/Sahara with full OEM fenders: up to 38-inch tires (4-inch bump stop height recommended)
• Sport/Sahara with trimmed or high-lined fenders: up to 40-inch tires
• Rubicon with full OEM fenders: up to 39–40-inch tires
• Rubicon with trimmed or high-lined fenders: up to 42-inch tires
• Sport/Sahara wheel backspacing recommendation: 3.5 inches for 37–38-inch tires

The Rock Krawler JL45XF-4XES1 is a complete, all-inclusive suspension system that serves as the foundation for every adventure — whether daily driving, towing, or conquering technical trails. A front CV driveshaft upgrade is recommended when front shock maximum extended length exceeds 29 inches. Installation of limiting straps is also recommended after final setup to prevent over-extension of suspension components.