The TeraFlex JK 4? Suspension Lift Kit delivers everything that you need to conquer the most extreme trails and conditions. Drivability and performance are the most important factors that are engineered and built into every TeraFlex lift kit. Properly developed suspension geometry, roll center, and load tuning ensure that all factory stability controls remain functional and within the parameters that Jeep originally engineered into the vehicle. TeraFlex kits drive straight and will crawl anything, getting you there and back! This system includes 4? lift coil springs, all lower and upper adjustable FlexArms, 9550 VSS shocks, front adjustable trackbar, front swaybar disconnects, rear swaybar links, rear trackbar bracket, bumpstops and all necessary hardware. This kit will allow you to run up to a 37? tire (aftermarket wheels with 4.5? backspacing or less are required). Fits all JK Wrangler models including Rubicon and Unlimited. Note: Driveshaft modifications are highly recommended with this suspension system. 2012+ JKs require exhaust spacers (#2610000) or other exhaust modification for proper driveshaft clearance. Material: Steel, polyurethane, rubber Title: TeraFlex Jeep Wrangler 4" lift kit