M1 Monotube Rear Shocks 2.5 4.5" Ford F 250 F 350 Super Duty (99 16 M1 Rear Shocks 5 7.5 Inch Ford Super Duty 2WD 4WD (17 22) Rough Country M1 Front Shocks 7.5 8" Ford F 250 Super Duty 4WD (2005 2026 Rough Country 5 7.5" N3 Rear Shocks for 99 16 Ford Super Duty 23201_A. Whether you're tackling tough terrain or smooth city streets, Rough Country's Nitrogen charged M1 Monotube Shock Absorber leads the way, delivering impeccable ride quality and performance mile after mile. Rough Country's Monotube M1 Shocks feature an internal floating piston design that keeps the shock oil and high pressure nitrogen separate. The result is a lightning fast reaction with no cavitation just unbridled vibration damping at each and every obstacle. The M1 Monotube Shock Absorber is more than an upgrade it's a true performance shock. Each shock features a steel body that is brushed and glavanized boasting a passivation sealing technology that is sure to withstand the elements. The internal 46mm digressive piston offers countless years of durability. The M1 is designed to be mounted body up for a more interesting look on the vehicle. Features: M1 Rear Shocks 5 7. 5 Inch Ford Super Duty 2WD 4WD (17 22) 2 inch seamless extruded tube. 46mm digressive piston. Self adjusting, deflective disc independent rebound and compression. 18mm centerless ground, case hardened, chromed, and super polished rod. 46mm monotube design ensures consistent, fade free performance in all conditions. Digressive valving instantly reacts to changing surface conditions. Zinc plated for resistance against harsh elements. Available in various lift heights for multiple applications. Durable vulcanized natural rubber bushings. 3 year Manufacturer's Warranty Sold in pairs