ICON Vehicle Dynamics F-150 Suspension Lift Kits are designed with maximum performance and the serious driver in mind. ICON engineers' primary focus is to increase wheel travel and damping ability, which translates into outstanding vehicle control and ride quality both on and off-road. The Stage 4 system includes vehicle-specific tuned 2.5" coil-over Shock featuring an internal reservoir for exceptional cooling properties and ICON-engineered Eibach coil springs for superior vehicle "feel" through the range of travel. These coil-overs are also height adjustable from 0-3" allowing the use of larger, more aggressive wheel and tire combinations. Uniball upper control arms on the F-150 not only add strength and durability, but help retain factory alignment spec range increasing castor over stock. ICON 2.5 Series Piggyback w/ CDCV rear Shock utilize a vehicle-specific valving that balances the performance of the truck from front to rear. 2.5" CDC reservoir Shock ensure optimum performance by increasing the duration of consistent damping regardless of situation, keeping the Shock at a cooler operating temperature during heavy use. ICON's CDC Valve upgrade is included in this stage for those desiring an easy way to tune the ride externally with 10 settings from soft to hard. The ICON Vehicle Dynamics 09-13 F-150 2wd Stage 4 Suspension Lift Kit is an excellent choice for those drivers looking to enhance the capabilities of their pickup on the road as well as in the dirt.