Improve the on-road comfort and off-road control of your 2021-2024 Ford F150 4WD to FOX Performance Series 2.0 IFP (internal floating piston) rear shocks. Designed to fit a 0 to 1-inch lift 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.