Jeep Suspension Lift Kits, Leveling Kits and Suspension Parts | Wrangler JL JK LJ TJ YJ, Gladiator JT, Cherokee XJ, Grand Cherokee WJ ZJ, Comanche MJ | JKS Manufacturing JKS Manufacturing produces the highest quality suspension lift kits and performance enhancing upgrades for Jeep vehicles including Wrangler and Gladiator. Made in the USA, our suspension lift kits and components are engineered for performance, ride quality and strength. Engineered for JL, JK, JT, TJ, LJ, XJ and YJ.