Fabtech's 2021 Ford Bronco 4WD Leveling Kit features CNC machined aluminum front billet spacers that work in conjunction with the factory Coilover shock assemblies. They are designed to bolt in without the disassembly of the factory coilover shocks for a fast installation. Fabtech engineers have established that the design of these billet spacers are at the maximum height without creating ball joint or tie rod bind when the suspension is cycling throughout the entire range of travel. The Fabtech spacers are installed on top of the coilover. This lift method retains the Bronco's compliant smooth ride with additional front lift to help level and provide clearance for oversized tires. Fabtech offers an exclusive Trade Up program on all their Leveling Kits. If you ever want to step up to a complete Fabtech Lift Kit after you buy a Leveling Kit, you can trade in the previously purchased kit towards the price of a new Fabtech system. Please see program details.