An aftermarket adjustable track bars is not required but is needed to center the axle underneath the vehicle correctly. ICON always recommend using an aftermarket track bar on solid axle applications to adjust for shift in the axle position due to lift. 99-04 Ford Super Duty’s will utilize the following tack bar:

39290 - 99-04 FSD ADJ TRACK BAR KIT

For more information contact ICON tech-support (951) 689-ICON.