Our 5.5 X Factor Coil Over System is the best performing trail suspension for JK owners looking to run 37 tall tires with stock fenders or up to 40 tall tires with flat fenders. This system features the Rock Krawler Independent Three Link Conversion front and rear. The Independent Three Link's 100% bind free design has proven its self to be the best choice for those looking for maximum articulation while maintaining a factory like highway ride and tight handling.This system features the best in class cross over angles and ground clearance. The rear suspension features adjustable anti-squat so you can dial in your JK's suspension to your liking. All of the high clearance lower control arms are made from 2 O.D. 7/16 Wall DOM alloy steel and built for abuse. Like all other JK X-Factor Systems the rear axle has been moved back 1 to allow for greater clearance between the tire and factory sliders for Rubicon Owners. To top it off, the 5.5 X Factor Coil Over System includes front 2.625 RRD Spec'd Prodigy Coil Overs making height adjustability and future tune-ability a snap. This system is completely upgradeable to any other Rock Krawler Wrangler JK System and comes with our exclusive Abuse Proof Lifetime Warranty on all hard parts! System Benefits: Excellent Highway Ride and Handling Unbelievable Off-Road PerformanceIndependent 3 Link Conversion Front and Rear (100% Bind Free Suspension)Best in Class Ground Clearance and Cross Over AnglesAdjustable Rear Anti-SquatIn Vehicle Adjustable Front Upper Arm making Alignment a Snap High Steer Upgrade w/ Off-Road Pro Drag Link Massive 13 Travel 2.625 RRD Spec'd Prodigy Remote Reservoir Coil OversLong Travel Functional Multi Rate Rear Coil SpringsPRO Front Sway Bar Disconnects/Extended Links PRO Rear Extended Sway Bar LinksSport Tuned 2.0 Rear RRD Spec'd Prodigy Remote Reservoir ShocksRepositions the Rear Axle Back up to 1 Over Stock37 Tires (OEM Fenders)Up to 40 Tires (Flat Fenders)Abuse Proof Lifetime Warranty on All Hard Parts Upgradeable to any other Rock Krawler System System Includes:(2) Tuned 2.625 RRD Spec'd Prodigy front coil over shock assemblies(4) Weld on coil over mounts(2) Long travel functional multi rate rear coil springs(2) 2.0 RRD Spec'd smooth body Prodigy rear shocks(4) High clearance-adjustable lower control arms made from 2 O.D. 7/16 Wall DOM alloy steel(2) Double adjustable track bars made from 1.5 solid alloy steel with Anti-Wobble Joints (4) Long arm mounts and cross member made from 1/4 thick laser cut steel(2) High misalignment adjustable upper control arms made from 1.625 solid alloy steel(1) Rear independent 3rd link mount made of 1/4 thick laser cut steel(1) Weld on rear axle truss with adjustable anti-squat(1) Off-Road pro drag link(2) Track bar relocation brackets made from thick laser cut steel(1) Adjustable front sway bar disconnects(2) Rear extended sway bar links(4) Long travel stainless steel brakes(1) Pair of sway bar straps(2) Rear coil spring degree wedges(2) Extended rear bump stops, hardware and detailed instructions NOTES! - Welding of the Rear Cradle, Rear Third Link Mount, Front and Rear Long Arm Mounts is required. - Removal of the OEM lower control arm mounts front and rear is required. - Removal of the front upper control arm mount on the driver side is required. - Minor exhaust rerouting required before the collector on the driver's side. This is recommended to be done prior to the suspension system being installed. - Recommend installing limiting straps to avoid over extension of suspension components after vehicle is all set up.- We typically recommend 4.5 of back spacing on rims for 33 and 35 tall tires. - We typically recommend 3.5 of back spacing on rims for 37/40 tall tires.- The X Factor System allows the rear axle to be pushed back up to 1 over stock which perfectly centers the rear axle assembly under typical aftermarket flat fenders. It also allows for larger tires without contacting the rock sliders or rear pinch seam.- The rear upper third link is designed around standard low pinion rear axles. When ordering for high pinion rear axles please contact us directly so we can ensure proper fitment as best as possible.