Rock Krawler 4.5 Inch X Factor Pro Elite Mid-Arm System - Jeep Wrangler JKU 4-Door

The 4.5 inch X Factor Pro Elite is the top of Rock Krawler's mid-arm line for the Jeep Wrangler JKU 4-Door. The lower control arms are the company's signature PB+J (Pure Beef and Jealousy) mid-arms machined from billet 7075 aluminum, and the other four arms are machined from round 7075 aluminum with the X Factor features built in, including 95 degrees of total misalignment. It installs as a complete bolt-in system.

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

• 4 x triple-rate coil springs
• 2 x machined 7075 aluminum front adjustable lower control arms
• 2 x machined 7075 aluminum front adjustable upper control arms
• 1 x Pro-X top mount drag link
• 1 x adjustable front track bar
• 2 x quick disconnect front sway bar links
• 2 x machined 7075 aluminum rear adjustable lower control arms
• 2 x machined 7075 aluminum rear adjustable upper control arms
• 2 x rear spring pads
• 2 x adjustable rear sway bar links
• 1 x bolt-on rear track bar relocation bracket
• 1 x rear track bar
• 1 x front and 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).

Why this system

• PB+J lower control arms machined from 2 inch by 3 inch billet 7075 aluminum, with the other four arms machined from round 7075
• X Factor features built in: 95 degrees of total misalignment, Adventure Series joints at the frame and Pro Krawler joints at the axle
• Adjustable arms to tune caster and pinion angle front and rear
• Triple-rate coils with correction pads and vehicle lean correction
• Track bar geometry corrections front and rear to center the axles
• Can be upgraded to a Rock Krawler long-arm system later

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.

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 up-fitted build in the back, we recommend upsizing 1 inch in coil lift height for the rear.
• We recommend a new front driveshaft if you plan to off-road routinely. (Adam's Driveshafts, Tom Woods, J.E. Reel)

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.