The TeraFlex JK extra-short rear upper FlexArm can be added to any existing suspension lift. FlexArms allow custom pinion and caster angles to be set for proper alignment, they also are used to re-center the axle in the wheel well for proper suspension movement, and to adjust wheelbase length. This kit includes one adjustable JK extra-short rear upper FlexArm. These FlexArms are designed to be used with a 3 inch or less lift kit where rear pinion adjustment is needed and stock lower control arms are retained.Fits: 07-Present Jeep Wrangler JK 07-Present Jeep Wrangler Unlimited JK Details: JK Extra Short Rear Upper Adjustable FlexArm Used To Align And Re-Center The Axle For Lifts Of 3 Inches Or Less Fully Adjustable Black Powdercoat Finish Sold Individually