SuperPro RC0127FZ-30 30mm Heavy Duty 2-Position Adjustable Front Sway Bar Kit (without KDSS)SuperPro RC0127FZ 30 30mm Heavy Duty 2 Position Adjustable Front Sway Bar Kit (without KDSS) 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.