Upgrade the on-road comfort and off-road control of your 1999-2016 F-250/F-350 Super Duty to FOX Performance Series 2.0 IFP (internal floating piston) rear shocks. Designed to fit a BDS 8-inch lift suspension kit. The mono-tube design's internal reservoir separates the shock oil from the high-pressure, nitrogen-charged gas chamber. The IFP eliminates oil aeration allowing maximum performance from the factory-tuned, precision valving. FOX and BDS joined forces to custom valve each application to work perfectly with each BDS Suspension system. Based on FOX race products but re-designed to turn your BDS-equipped truck into an off-road machine providing a predictable ride - capable of handling the roughest conditions with fade-free performance.