The Rock Krawler JK 2.5 X-Factor Long Arm Stretch System is the best performing trail suspension for JK owners looking to run 37 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 custom 2 O.D. 7/16 Wall DOM steel and built for abuse. The JK X-Factor Stretch Systems repositions the rear axle back 3 to yield a perfect 99 wheelbase. The 99 wheelbase is a great compromise for those looking to gain a little wheelbase for improved climbing ability, but not loose too much cross over ability while maintaining the vehicle 50 states street legal. This system comes with our exclusive Abuse Proof Lifetime Warranty on all hard parts! System Benefits: Excellent Highway Ride and Handling Unbelievable Off-Road AbilityIndependent 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 Long Travel Functional Multi Rate Coil SpringsPRO Front Sway Bar Disconnects/Extended Links PRO Rear Extended Sway Bar LinksRepositions the Rear Axle Back 3 For a Perfect 99 Wheelbase37 Tires (Flat Fenders)Abuse Proof Lifetime Warranty on All Hard Parts Upgradeable to any other Rock Krawler System System Includes:(4) Long travel functional multi rate coil springs(4) High clearance-adjustable lower control arms made 2.0 O.D. 7/16 wall DOM 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 double 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(2) Full replacement rear track bar relocation bracket made from thick laser cut steel(2) Weld on offset rear axle spring pads(1) Adjustable front sway bar disconnects(2) Rear extended sway bar links(4) Long travel stainless steel brakes(1) Pair of sway bar straps, hardware and detailed instructions NOTES! - The X Factor Stretch System is designed for flat fender and stretch rear corner use. This will require body work.- 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 tall tires.- 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.