Developed from our off-road race shocks, FOX Factory Race Series combines race-proven technology with new, cutting-edge features to provide enhanced ride-quality and winning damping performance you can bolt onto your truck or SUV. Kit: 04-08 4wd and 09-On 2wd/4wd Ford F-150 Rear; 2.5 Series; P/B; 11.0/quot;; 0-1.5/quot; Lift Uncompromised performance through FOX*s patented internal bypass technology delivers the feel of near-endless suspension travel. Exclusive internal bypass technology allows oil to flow around the piston at some points of the stroke * while creating humongous pressure at other points * supporting the vehicle like no other product can. Floating through terrain is accomplished with FOX*s ride zone * combining a race-developed shock piston, internal bypass and Dual Speed Compression adjustment * allowing fine tuning for weight, terrain and speed. Dominate any terrain with the brute strength of 3- and 2.5-inch aluminum bodies, cactus cooler reservoirs and 7/8* shafts with redundant seals, all proven in the harshest of environments under the toughest of conditions. Ford F-150: 2004 - 2020