Yup, forgot to mention two link with panhard bar (thats the bar that is going side to side from the frame to the axle). The panhard bar is what causes the axle to shift to the side when adjusting the ride height. The track bar that John mentioned goes diagonally from one link bar (near the axle pivot end) to the other link bar ( near the frame pivot end) Check out IF Customs website
www.ifcustom.com They have some pics of track bar installs on there site.