Fabtech's 4" 4 Link Conversion System for the Ford F250/F350 is designed to provide maximum suspension performance for both on and offroad use. The system replaces the factory Radius Arm suspension with heavy duty 4 Link components for increased strength and functionality. The system will provide near zero caster change throughout the travel range which benefits on road driving. When offroad the 4 Link system will provide more articulation than a Radius Arm for increased terrain traversing at all speeds. The front suspension receives the finest shock upgrade on the market with the Dirt Logic 4.0 Coilover conversion. It will provide outstanding damping capacity offroad with a quality on road ride. This Coilover bolts in place of the factory coil spring without removal of the coil spring bucket. The Dirt Logic is constructed with a stainless steel body for maximum corrosion resistance. It comes with a giant 4" diameter aluminum remote reservoir that mounts horizontally above the Coilover to allow for full compression travel with oversized tires. The rear suspension receives a 5" lift block, extended bump stop brackets and Dirt Logic 2.25 shocks for a balanced ride quality. This 4 Link system with the Dirt Logic 4.0 Coilovers is the pinnacle of all Super Duty suspension systems for owners that demand the best. System includes a free 5 year 60,000 mile powertrain warranty. Each Fabtech component has been designed with specific features and benefits that create this quality suspension system. For a greater understanding of each these components, please see below.. For the ultimate in suspension performance for the Super Duty we offer a bolt on 4 Link System that provides unsurpassed articulation and wheel travel. These 2 diameter heavy wall links feature race style 1 Uniballs for superior strength. Thick 1/4 steel brackets secure the 4 Links to the frame without cutting or welding. The system also includes Sway Bar Drops, Trac Bar relocation bracket, Pitman Arm, and U-Bolt kit.. TIRE SIZE - 315/70R17 WHEEL - 17X8 W/4 1/2" BS W/MINOR TRIMMING; TIRE SIZE - 325/65R18 WHEEL - 18X9.5 W/4 3/4" BS W/MINOR TRIMMING; TIRE SIZE - 35/12.50R20 WHEEL - 20X10 W/5" BS W/MINOR TRIMMING; 3. NON DUALLY MODELS ONLY.; 42. WILL NOT FIT GAS MOTORS.; 163. VEHICLES EQUIPPED WITH 2 PIECE DRIVESHAFT REQUIRE FTS419.. Fabtech 11-16 Ford F250/350 4WD Diesel 6in 4 Link System w/DL 4.0 Coilovers & Rear DL 2.25 Shocks. 4" 4LINK SYS W/ 4.0 & 2.25 11-16 FORD F250/F350 4WD. 4in. 4LINK SYS W/4.0/2.25 11-16 FORD F250/F350 4WD. 4 Link Lift System; 4 in. Lift;. 4in. 4LINK SYS W/4.0. 4" 4LINK SYS W/ 4.0. Suspension Lift Kit

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