This 4.5 inch X Factor X2 long arm system is Rock Krawler's answer for a Jeep Wrangler JLU 392 that is going to get pushed hard. Both ends use an independent 3 link design, and the whole package is built around getting the axles to move. The Pro Elite version adds PB&J billet aluminum lower control arms, machined in-house from solid square stock. No Limits means the front sway bar links are made to work with the factory electronic sway bar disconnect on Rubicons.
What's in the kit
- Weld-on long arm hardware: front long arm mounting system, (2) rear frame side long arm mounts, (2) rear axle side control arm mounts, rear frame side upper control arm mount, rear track bar mount and rear axle truss
- (2) weld-on rear upper shock mounts and (4) rear upper shock mounts
- (4) billet 7075 aluminum adjustable lower control arms, an adjustable front upper control arm and a rear upper control arm
- Front and rear adjustable anti-wobble track bars
- "No Limits" front sway bar kit and (2) rear extended sway bar links
- (4) triple-rate coil springs and (4) coil spring correction seats (Comp coilover packages ship the rear pair only)
- Heat Shield Products Sticky Shield kit for the front control arm joints
- (2) rear brake line relocation brackets
Why this system
- Independent 3 link design front and rear for maximum articulation.
- Double adjustable upper control arms front and rear that upsize the factory hardware to 14mm, with a 2 3/8 inch mounting width and 1 inch Pro Krawler joints at each end. The arm itself is solid chromoly steel.
- Front sway bar links made for the factory electronic sway bar disconnect found on Rubicons. That is the "No Limits" part.
- PB&J billet aluminum lower control arms, custom machined in-house from solid square stock. That is where Pro Elite comes from.
- Adventure Series maintenance free joints at the frame end of the lower control arms cut down on grease points, absorb vibration and keep proper misalignment off-road.
- X2 rear geometry with enhanced rear instant center and roll center, plus adjustable rear anti-squat.
- High clearance rear axle mounts gain 4.5 inches of ground clearance under the rear axle compared to stock, and rear upper shock relocation brackets keep your shock and suspension travel.
- Triple-rate coils that work together for a ride Rock Krawler says beats the OEM linear rate springs, with free length set for off-road articulation. Correction seats take out the spring bow from the factory setup.
- A Heat Shield thermal barrier kit protects the front control arm joints at the frame, the same idea Jeep uses from the factory.
- Lifetime warranty coverage is listed in the system benefits.
Pick your package
The arms and brackets are the same in every package. The Package option is what changes.
- Base System - No Shocks: The full arm and bracket system with no shocks, for anyone who already has shocks they want to run or is sourcing a shock package separately. Bump stops ship with the shock packages; with no shocks, Rock Krawler sells them separately as RK07124.
- Stage 1 - RRD 2.25 IFP Shocks: Rock Krawler's own RRD 2.25 inch IFP shocks, built in-house. Fluted aluminum bodies with the cooling surface area of a 2.5 inch shock, 3/4 inch 17-4 PH stainless shafts with hard chrome plating, billet aluminum valve circuits, dual DU shaft bearings and double redundant sealing. Serviceable, rebuildable and revalveable.
- Comp Coilover System - Stage 1: Coilovers up front, coil springs in the rear. The front is a 2.625 inch RRD racing coilover with a remote reservoir (13 inches of shock travel, 14.4 inches of front axle travel) and the rear gets matching 2.625 inch RRD racing shocks with remote reservoirs. A good fit if you want coilover adjustability up front but still carry small loads or tow a small trailer.
- Comp Coilover System - Stage 2: The Comp layout with Fast CD (compression damping) adjusters added to the front coilovers and the rear shocks, for even more tuning.
- Trail Runner Coilover System - Stage 1: 2.625 inch RRD racing coilovers with remote reservoirs at all four corners. It maximizes off-road ability and comes tuned for the street, but Rock Krawler cautions that rear coilovers do not handle changing loads well, so regular towing or heavy weight in the bed is not ideal.
- Trail Runner Coilover System - Stage 2: The Trail Runner layout with Fast CD adjusters on the coilovers for the most tuning. Same caution about heavy loads in the bed applies.
Generic shock lengths for the shock packages are 18.31 inches collapsed and 30.31 inches extended in front, and 19 inches collapsed and 31 inches extended in the rear.
Fitment and what else you will need
- Fits the Jeep Wrangler JLU 392. Rock Krawler lists the 392 as its own version of this system.
- Rock Krawler bases all lift heights on Rubicon models in a standard build: front bumper and winch, rear bumper and a full size spare.
- Rock Krawler's tire and wheel guidance for this No Limits system is written for Rubicons. With full OEM fenders they recommend 37 or 38 inch tall tires, with trimmed or high lined fenders 40 inch tall tires, both with a 3 inch bump stop height, and backspacing of 4.5 inches for 37 inch tires or 3.5 inches for 40 inch tires.
- Rock Krawler suggests dropping 1 inch of rear coil lift height if you are building with a spare delete, and going up 1 inch for an overland or heavily loaded rear.
- Install: requires welding the front and rear long arm mounts, removing the OEM frame side lower and upper control arm mounts front and rear plus the OEM axle side rear lower control arm and track bar mounts, and modifying the OEM rear shock mounts to weld on the raised rear upper shock mounts (front shock mounts too on the coilover packages).
- Front 3 link systems need aftermarket front axles that do not have F.A.D.
- Rock Krawler recommends a new front C.V. driveshaft for any front shock with a maximum extended length over 29 inches, and limiting straps to avoid over-extending suspension components.
Rock Krawler lists lifetime warranty coverage on this system.
