If you have a lifted vehicle and you hear a clunk during full articulation, it might be the Front Upper Control Arm making contact with the Coil. Roadsafe have a variety of extended Upper Ball Joints, that fit to the Upper Control Arm, to space the arm far enough to avoid the factory upper arm from hitting the coil on full droop. As an added bonus, they also provide an extra inch of downward travel, plus improves camber.