X-Factor is the step up from the Adventure-X arms, and this No Limits version is set up for the Rubicon Wrangler JLU (4-door). Rock Krawler's X-Factor arms are adjustable uppers and lowers with a total of 95 degrees of misalignment, which is more than the Adventure-X design, and they use two different joints: maintenance-free Adventure Series joints at the frame, and Pro Krawler joints at the axle.
The "No Limits" front sway bar links are made for the factory electronic sway bar disconnect, with factory-sized hardware, a CNC machined billet aluminum center section and Made in USA FK Bearing heim joints. Press the button and the front end gets out of the way. It is a complete bolt-in mid-arm system, and Rock Krawler says it has the best off-road ability of any of its mid-arm systems.
What's in the kit
The base kit, as Rock Krawler lists it:
- (2) front and (2) rear high clearance adjustable lower control arms
- (2) front and (2) rear high clearance adjustable upper control arms
- (4) triple-rate coil springs and (2) front, (2) rear spring pads
- (1) adjustable front track bar and (1) rear adjustable track bar
- (2) "No Limits" sway bar links
- (2) adjustable rear sway bar links
- (1) bolt-on rear track bar relocation bracket
- Bump stops with every shock option (not included with the base system)
The coilover packages (Comp) swap in front shock towers and brackets, and keep two rear triple-rate coil springs with rear spring correction seats.
Why this system
- 95 degrees of misalignment. The X-Factor series arms cut down the bind in a factory JL control arm.
- Two joint types, one idea. Maintenance-free Adventure Series joints at the frame, Pro Krawler joints at the axle.
- High clearance arms, all eight adjustable. Tune caster and pinion angle front and rear.
- "No Limits" front links. They work with the Rubicon's factory electronic disconnect.
- Triple-rate coils. Rock Krawler says the highway ride is better than the factory linear-rate springs, and the coil stays seated in the bucket as long as you run a proper length shock.
- Track bars front and rear. Adjustable front and rear bars and a bolt-on rear track bar relocation bracket let you center the axles.
- Upgradable. Rock Krawler lists the kit as upgradable to its long arm system.
Pick your package
The Package option sets the shocks. The Configuration option matches the kit to your drivetrain.
- Base System (No Shocks). Kit only, for buyers who already have shocks picked out. Bump stops ship with every shock option; with no shocks they are sold separately (Rock Krawler lists them as RK07124). Generic shock lengths for the gas, diesel and 4xe kits: front 18.31 inches collapsed and 30.31 extended, rear 19 collapsed and 31 extended.
- Bilstein 5100 Shocks. Maintenance-free shocks that Rock Krawler calls a great pairing with its multi-rate coil springs.
- Stage 1 Shocks (RRD 2.25 IFP). Rock Krawler's in-house shocks: a 2.25 inch hard anodized fluted aluminum body with the cooling surface area of a 2.5 inch shock, a 3/4 inch hard chrome stainless shaft and dual DU shaft bearings. Serviceable, rebuildable and revalveable.
- Comp Coilover Stage 1 and Stage 2. The Comp System runs 2 5/8 inch RRD racing coilovers with remote reservoirs up front and matching 2 5/8 inch RRD shocks with remote reservoirs in the rear, with coil springs still holding up the back, so it can still carry small loads or tow a small trailer. Stage 2 adds Fast CD (compression damping) adjusters. Rock Krawler lists 14.4 inches of front axle travel and 13.9 inches of rear axle travel.
Fitment and what else you'll need
- Fits 2018 and newer Jeep Wrangler JLU 4-door models, Rubicon. Choose the Configuration that matches your Jeep: gas, diesel, 4xe, 392.
- 392 kits: Rock Krawler notes that JLU 392 lift heights sit above Jeep's factory lifts, so ride height ends up about 1 inch taller than a same-lift V6 Wrangler Rubicon.
- Rock Krawler's tire guidance for Rubicon models: 37 or 38 inch tires with full OEM fenders, and 40 inch tires with trimmed or high-lined fenders, both at a 3 inch bump stop height. Recommended backspacing is 4.5 inches for 37s and 3.5 inches for 40s.
- Lift heights are based on a standard Rubicon build (front bumper and winch, rear bumper and full-size spare). Rock Krawler suggests dropping 1 inch of rear coil lift if you delete the spare, and going up 1 inch if you load the back for an overland-style build.
- A new front driveshaft is recommended if you wheel the Jeep routinely, and Rock Krawler recommends welding the rear cradle with 37 inch tires or larger.
- The coilover packages need fabrication: the listing calls for removing the factory shock mount on the frame and the shock and spring mount on the axle, and welding the new coilover mount to the axle.
Rock Krawler lists lifetime warranty coverage on the system itself, and its RRD shocks carry a separate 6 month warranty against defects in materials and workmanship.
