Fabtech 17-20 Ford F250/350 4WD Diesel 4in Front Dirt Logic 4.0 Reservoir Coilover - PassengerBrand Fabtech Part Number FTS835242P Category Suspension Coilovers Condition Brand New Original Manufacturer Packaging Fabtech takes their 4 in. Super Duty systems to the next level with the release of the Dirt Logic 4. 0 Coilover Conversion. This bolt on Coilover conversion will transform the ride quality of the Super Duty while providing outstanding damping capacity for rugged offroad use. The Dirt Logic 4. 0 Coilover is constructed with a stainless