The 3.5" of lift height is achieved using our unique offset top mount spacer design. These CNC-machined billet aerospace-grade Aluminum lift spacers feature a unique offset bolt design engineered to position the strut into the stock position. This translates into proper suspension clearance and guarantees your truck will ride like it was stock. Additionally, we include a machined billet pre-load spacer that installs between the top of the spring and the bottom of the strut hat to pre-load the spring. This also acts as a droop limiter which insures CV axles durability on 4WD models without exceeding the CV limits which works well within the OEM tolerances. To lift the rear we include OEM style 3" tall cast rear lift blocks with built in bump stop landing pads. These blocks include dual locator pins.. For trucks with a two-piece driveshaft, we also include a carrier bearing spacer - All of this contributes to an excellent driving and handling suspension system that truly upgrades your Ford F-150 truck! NOTE: Not for use on trucks that are factory pre-lifted/leveled or that have the "off-road package". Check factory height prior to ordering or installing. Trucks with more than 22" of wheel hub to fender lip height may require less lift.