Rock Krawler 4.5 Inch Adventure-X2 Long-Arm System - Jeep Wrangler JKU 4-Door

The 4.5 inch Adventure-X2 long-arm system for the Jeep Wrangler JKU 4-Door pairs a high-clearance 4-link front suspension with a high-clearance independent 3-link rear. Rock Krawler pitches it as the compromise between daily driver and hard-core off-roader. Every control arm uses the service-free Adventure Series joint, so there are no grease fittings to chase.

It also comes as a Comp System with 2 5/8 inch RRD racing coilovers up front and matching remote reservoir shocks in the rear, for owners who want coilover adjustability but still need to carry small loads or tow small trailers. Rock Krawler bases its lift heights on Rubicon models in a standard build, meaning a front bumper and winch, a rear bumper and a full-size spare.

What's in the kit

• 2 x front frame side weld-on long-arm mount
• 1 x weld-on raised trackbar mount
• 1 x top mount Pro-X drag link
• 2 x heat shield thermal barriers
• 1 x 1/4 inch thick laser cut steel cross member
• 2 x front high clearance adjustable lower control arm
• 2 x front adjustable upper control arms
• 1 x front adjustable anti-wobble track bar
• 1 x front sway bar disconnect kit
• 4 x front/rear triple-rate coil spring
• 2 x rear frame side weld-on lower control arm mount
• 2 x rear high clearance adjustable lower control arm
• 1 x rear double adjustable upper control arm
• 1 x rear adjustable anti-wobble track bar
• 1 x rear weld-on dual sport track bar bracket
• 1 x rear weld-on axle truss
• 2 x rear frame side weld-on shock mount
• 2 x rear axle side high clearance control arm/shock/sway bar link mount
• 2 x front/rear extended brake line kit

Bump stops come with every shock package. On the base system they are not included, but they can be bought separately (RK07123). The coilover packages add: front shock mounts.

Why this system

• Maintenance-free control arms with Adventure Series joints in every arm
• High-clearance 4-link long-arm front and high-clearance independent 3-link long-arm rear
• X2 rear geometry with enhanced rear instant center and roll center
• Adjustable rear anti-squat
• High-clearance rear axle mounts gain 3.5 inches of clearance under the rear axle versus stock
• Weld-on long-arm mounting brackets with weld scheduling like OEM
• Rear upper shock relocation brackets so you do not give up shock or suspension travel

Pick your package

• Base System (No Shocks): the full kit with no shocks, for builds where you already have shocks picked out.
• Stage 1 (RRD 2.25 Inch IFP Shocks): Rock Krawler's in-house shock with a 2.25 inch O.D. hard anodized fluted aluminum body, a 3/4 inch 17-4 PH stainless steel hard chrome plated shaft, a billet aluminum valve circuit, dual DU shaft bearings and double redundant sealing. It is serviceable, rebuildable and revalveable.
• Stage 2 (RRD 2.25 Inch FCD Shocks): Everything in the IFP shock plus a Fast Compression Damping (FCD) adjuster, up to a 30 percent increase, so you can fine-tune ride quality and handling.
• Comp System Stage 1 (Coilovers): front 2.625 inch RRD remote reservoir coilovers with 12 inch of shock travel, which Rock Krawler says yields 13.88 inch of front axle travel, plus matching 2.625 inch RRD remote reservoir rear shocks with 10.5 inch of travel for 12.1 inch of rear axle travel.
• Comp System Stage 2 (Coilovers, Fast CD): the same coilover and rear shock layout with Fast CD (compression damping) adjusters on the coilovers and rear shocks for more tuneability.

Rock Krawler's generic shock lengths for this system are front 18.5 inch collapsed and 29 inch maximum extended and rear 17.3 inch collapsed and 28.31 inch maximum extended, which is handy if you plan to shop for your own shocks.

Fitment and what else you'll need

Fits 2007-2018 Jeep Wrangler JKU 4-Door models. Rock Krawler lists it for Sport, Sahara, Willys and Rubicon trim levels.

• If building with a spare delete we recommend dropping 1 inch in coil lift height for the rear.
• If building an overland or heavily upfitted build in the back, we recommend upsizing 1 inch in coil lift height for the rear.
• Requires removal of: OEM frame side front and rear lower control arm mounts; OEM frame side front and rear upper control arm mounts; OEM rear axle side brackets; OEM frame side rear shock mount.
• Requires welding of: front and rear frame side long-arm mounts; provided rear axle side control arm/shock/sway bar link bracket, track bar bracket and rear axle truss; provided frame side rear shock mount.
• Minor exhaust rerouting required before the collector on the driver's side. This is recommended to be done prior to the suspension system being installed.
• Rear shocks will require a standard bushing and sleeve just like the rear lower shock bushing and sleeve. We have removed the weakness of the bar pin setup with the supplied rear upper shock mounts.
• Recommend installing limiting straps to avoid over extension of suspension components after vehicle is all set up.
• This system allows the rear axle to be pushed back up to 1 inch over stock which perfectly centers the rear axle assembly under typical aftermarket flat fenders. It also allows for larger tires without contacting the rock sliders or rear pinch seam.
• The rear upper third link is designed around standard low pinion rear axles.
• Coilover packages: requires modifying the OEM front & rear shock mounts and welding of the raised upper shock mounts.

Tire guidance from Rock Krawler: 33 or 35 inch tall tires with full OEM fenders, 37 inch tall tires with flat fenders. They typically recommend 4.5 inch of backspacing with 33 and 35 inch tires and 3.5 inch with 37 inch tires.

Rock Krawler backs this system with lifetime warranty coverage.