These coil-over shocks are the ultimate suspension modification for your Super Duty. These are not race style shocks that were modified to fit they were designed from the ground up for the 2008 - 2016 Super Duty. They are adjustable in ride height from 7" to 9" of lift. They have any external Reservoir for excellent heat dissipation, a Dual Rate Spring for a great ride quality on or off-road, and are completely Rebuilable.