Rock Krawler 4.5 Inch T-Rex Pro Elite Hybrid System - Jeep Wrangler JLU 4xe

Jeep routed the 4xe cooling and trunk lines front to back right where long arm mounts would normally go, and Rock Krawler points out that very few people are qualified to touch the high voltage lines. The T-Rex hybrid works around that for the Jeep Wrangler JLU 4xe: a full mid-arm front end with a 3 link long arm rear conversion. Pro Elite means billet 7075 aluminum lower control arms, CNC machined and service free, at the front and rear.

What's in the kit

• (2) front billet 7075 aluminum adjustable lower control arms, (2) front adjustable upper control arms and (2) rear billet 7075 aluminum lower long arms
• (2) rear lower control arms and a rear upper control arm
• Rear long arm mount kit, rear upper frame mount, rear track bar mount, rear axle truss and (2) rear shock mounts
• Front and rear adjustable track bars
• Front sway bar disconnect kit and (2) rear extended sway bar links
• (4) triple-rate coil springs and (4) spring correction seats (Comp coilover packages ship the rear pair only)
• Rear brake line mount kit

Why this system

• Full mid-arm front end paired with a 3 link long arm rear conversion.
• Billet 7075 aluminum control arms, two up front and two long arms out back, CNC machined and service free.
• The 3 link rear with a track bar removes the natural binding of the stock rear suspension, so the rear moves smoothly without jacking.
• X2 rear geometry gains 4.5 inches of ground clearance under the rear axle without giving up any rear shock travel, and the rear roll center is raised to help handling and cut down on side to side axle shifting off-road.
• All of the control arms use Adventure Series joints, so they are maintenance free.
• 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.
• 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.
• Bilstein 5100 Shocks: Maintenance free Bilstein 5100 shocks, a good match for the multi-rate coil springs. Rock Krawler's Bilstein package for 3.5 and 4.5 inch lifts references Bilstein 24-310635 (two) and 33-292977 (two).
• 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 4xe.
• Rock Krawler bases all lift heights on Rubicon models in a standard build: front bumper and winch, rear bumper and a full size spare.
• Tires and wheels, per Rock Krawler: Sport and Sahara take 37 inch tires with full OEM fenders or 38 inch with trimmed or high lined fenders, on 3.5 inches of backspacing. Rubicons take 37 or 38 inch tires with full OEM fenders or 40 inch with trimmed or high lined fenders, on 4.5 inches of backspacing for 37 inch tires or 3.5 inches for 40 inch tires. A 3 inch bump stop height is recommended throughout.
• 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 rear long arm mounts, removing the OEM frame side upper and lower rear control arm mounts and 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.
• 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.