Overview

Rock Krawler Ultimate Adventure Mid-Arm 4XE Suspension Lift Kits

Rock Krawler engineers their Ultimate Adventure mid-arm 4XE suspension systems for Jeep JLU owners who want a true bolt-in system with excellent highway manners, backed by the durability and off-road performance Rock Krawler is known for. Built around their service-free Adventure Series control arm joints, these systems are designed to reduce factory suspension bind and deliver outstanding articulation without sacrificing everyday ride quality. Ultimate Adventure systems combine Adventure Series set-length (fixed) lower control arms with high-misalignment adjustable upper control arms to help restore and fine-tune suspension geometry—allowing precise caster adjustment up front and pinion angle tuning in the rear—with up to 70 degrees of misalignment. Ride and handling are further improved with tuned triple-rate coil springs and geometry corrections that help minimize spring bow, properly position the axles, and maintain predictable handling on the road. Order the Rock Krawler Ultimate Adventure mid-arm 4XE suspension lift kit best suited for your build.

More product features, items, and notes include:

• Offered at multiple lift heights so you can choose the stance and tire clearance that matches your build; availability varies by application
• Choose the shock package that fits your build: no shocks, Bilstein shocks (B51), or their in-house RRD 2.25 in. IFP shocks (S1); availability varies by application
• Listed components vary slightly by lift height/shock package
• Improved rear roll center, spring correction seats/pads, vehicle lean correction, and track bar geometry corrections (adjustable front track bar plus rear track bar relocation/geometry correction)
• System architecture designed to be a base for future suspension expansion, including long-arm upgrades, if desired
• Shock-equipped kits include bump stops; no-shock versions require bump stops to be purchased separately
• Tire size can affect wheel backspacing recommendations and may require trimming of full OE-style fenders
• Bump stop height of 3 in. is commonly recommended for full-fender builds (application dependent)
• Rear lift height adjustments are recommended for spare-delete or heavily up-fitted rear builds (typically done with one-inch taller or shorter rear coil springs)
* New front driveshaft recommended for frequent off‑road use
* XR packages (where applicable) do not require a raised rear track bar bracket due to factory axle configuration
• All lift heights are based on Rubicon models for a standard style build (front bumper and winch, rear bumper, and full-size spare)

Applications

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