Named the "Monolinear", this lift sports 6” mono leaf springs at all four corners, greaseable shackles front & rear, drop pitman arm, double disconnect sway bar links, re-designed track bar brackets and 40 durometer rubber bushings. Polyurethane can't touch this. Single Leaf springs equal zero friction. No friction means maximum flex and the Rock Ready shackles are industrial strength. These suspension lifts allow for maximum articulation & tire clearance for your Wrangler YJ. Front and rear stainless steed braided brake line are included. Pitman arm, slip yoke eliminator, replacement CV driveshaft and longer shocks are required and ordered separately.