Rock Krawler 4.5 Inch X-Factor Pro No Limits Mid-Arm Lift Kit - Jeep Wrangler JLU

X-Factor Pro takes the X-Factor design and builds every one of the eight control arms from solid 7075 aluminum. This is the No Limits version for the Rubicon Wrangler JLU (4-door), so the front sway bar links work with the factory electronic disconnect.

You keep everything that makes X-Factor tick (95 degrees of misalignment, Adventure Series joints at the frame, Pro Krawler joints at the axle) and the arms are aluminum across the board. It is a complete bolt-in system for Rubicon owners who want an all-aluminum mid-arm kit.

What's in the kit

The base kit, as Rock Krawler lists it:

• (2) front and (2) rear 7075 aluminum adjustable lower control arms
• (2) front and (2) rear 7075 aluminum 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

• All eight arms are solid 7075 aluminum. Rock Krawler builds the standard X-Factor benefits right in.
• 95 degrees of misalignment. Pro Krawler joints at the axle and Adventure Series joints at the frame keep the suspension from binding.
• Adjustable uppers and lowers. Set caster and pinion angle front and rear.
• "No Limits" links. Press the disconnect button, the front sway bar steps aside.
• Triple-rate coils, correction pads. The coils are tuned for highway comfort, and the pads reduce the spring bow inherent in the factory setup.
• Axle centering. Front and rear track bar geometry corrections and a bolt-on relocation bracket for the rear.

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.