RockJock JK 4D Antirock Sway Bar Kit Rear Bolt-On Forged ArmsRockJocks Antirock rear sway bar kit for all JK Wrangler Unlimiteds, 4 door), when used in conjunction with a front Antirock sway bar kit, provides balanced performance of front and rear suspension for rugged off road conditions. It gives the driver increased traction by balancing and distributing the weight and traction over all four tires. The Antirock off road sway bar is designed to directly replace the stock Jeep sway bar. This bar is made of SAE