ProComp/ Rubicon Express 3.5″ Super-Flex Short Arm Lift Kit With Mono Tube Shocks 04-18 Jeep JK

The ProComp Rubicon Express 3.5 Inch Super-Flex Lift Kit for the 2007 through 2018 Jeep Wrangler JK and JK Unlimited is a complete and performance oriented short arm lift system that combines 3.5 inch front and rear performance coil springs, matched monotube shocks, Super-Flex short arm geometry for improved articulation and caster correction, and all required track bar, sway bar, bump stop, and brake line hardware in a single bolt on package. 

Designed to clear 35x12.50 tires with proper wheel backspacing and support 37-inch tires with high-clearance fenders and appropriate supporting mods, this system gives JK owners the combination of confident on-road handling and serious trail flex that a properly built short-arm lift delivers. At IMM Hawaii Parts, we carry this kit for JK Wrangler owners who want a complete and properly matched lift system that goes beyond a basic spacer lift and addresses geometry, articulation, and damping performance in a single well-engineered package.

ProComp Rubicon Express 3.5 Inch Super-Flex Lift Kit Jeep JK With Monotube Shocks

The monotube shocks included in this system are tuned specifically for the JK Wrangler's weight and wheelbase, with a 3.5-inch lift. Monotube construction keeps shock oil and gas separated through the full stroke, delivering consistent and predictable damping performance through the complete range of JK suspension travel on the highway and off-road. The vehicle-specific tuning means these shocks are calibrated to the actual weight distribution and suspension geometry of the JK at this lift height, rather than using a generic damping curve not developed for this platform. 

For JK owners who have lived with a spacer lift and generic shocks and know the difference that proper damping makes, this system from IMM Hawaii Parts delivers a genuinely improved driving experience both on paved roads and on the trail.

Super-Flex Short Arm Geometry for Improved Articulation and Caster Correction

The Super-Flex short arm link geometry in this kit is designed to restore proper caster and handling after the 3.5-inch lift is installed while improving front and rear axle articulation beyond what the factory link geometry allows at this lift height. Proper caster correction is essential for maintaining straight-line stability and on-center steering feel on a lifted JK, and the Super-Flex geometry addresses this directly rather than leaving the caster in a compromised position that makes the truck wander and feel vague on the highway.

The improved articulation from the short-arm geometry means the axles have more freedom to move independently through rough terrain, keeping tires in contact with the ground longer for better traction and control on technical trail sections.

Front Adjustable Track Bar and Rear Track Bar Bracket for Axle Centering

This system includes a front adjustable track bar or relocation bracket and a rear track bar bracket to re-center both axles after the 3.5-inch lift is installed. When axles shift off-center after a lift, the truck tracks unevenly, the steering wheel sits off-center, and tire wear becomes uneven on both ends of the truck. The included track bar components allow precise axle centering after the lift is in place, restoring the factory-aligned feel and preventing the alignment and wear issues that occur when a significant lift is installed without addressing axle position.

Extended Sway Bar Links, Bump Stop Extensions, and Brake Line Relocation

Extended sway bar end links correct the sway bar geometry after the 3.5-inch lift, maintaining roll stability and handling feel on paved roads without limiting axle articulation on the trail. Bump stop extensions restore the correct bump stop clearance for full suspension travel without premature contact at the top of the stroke. Brake line relocation hardware ensures the factory brake lines are properly routed and supported at the new lifted ride height, preventing stretching or damage over time.

Compatible With Rubicon and Non-Rubicon JK Models

This lift system works with both Rubicon and non-Rubicon JK and JK Unlimited models from 2007 through 2018 in both 2-door and 4-door configurations. Rubicon models retain the electronic sway bar disconnect function with this system installed. Professional alignment is recommended after installation to confirm proper caster, camber, and toe settings with the new lift height and geometry correction components in place.

Tire Fitment for the Lifted JK

This system is designed to clear 35x12.50 tires with proper wheel backspacing as the primary confirmed fitment. Minor trimming or bump stop tuning may be required depending on the specific wheel and tire combination. For owners who want to run 37-inch tires, this is possible with high-clearance fenders and appropriate supporting modifications. Contact IMM Hawaii Parts for personalized wheel, tire, and supporting mod recommendations for your specific JK build and tire size goals.

Product Details

Why JK Owners Choose This System

The ProComp Rubicon Express 3.5 Inch Super-Flex Lift Kit for Jeep JK is the right choice for 2007 through 2018 JK and JK Unlimited owners who want a complete performance short-arm lift system with proper geometry correction, matched monotube shocks, axle centering track bar hardware, and clearance for 35-inch to 37-inch tires. Shop this kit and complete JK Wrangler wheel and tire packages at IMM Hawaii Parts, where our team can help you build the perfect lifted and properly aligned JK setup for trail use and daily driving.

Whether you're planning an off-road build or replacing worn components, contact IMM Hawaii Parts for expert advice and quality products.