SuperPro Roll Control Rear Sway Bar Packages are the perfect addition to a 4WD. The resistance to the fitment of rear Sway Bars to 4WD vehicles is the flawed concept of the loss of articulation in the suspension. If the replacement Sway Bars and link package is designed correctly, replacement Sway Bars can be fitted with minimal or no loss of articulation. Upgrading to Roll Control Sway Bars will: Improve the stability by compensating for the change in center of gravity of the chassis Neutralize the factory understeer Increase tire life Control the roll in load carrying and towing applications Improve safety with no loss of comfort or articulation 2003-2023 Toyota 4Runner (without KDSS) 2003-2009 Lexus GX470 (without KDSS) 2007-2014 Toyota FJ Cruiser (without KDSS)