Nitro 8000 Front & Rear Nitrogen Gas Shock Absorber Set. 1966-1977 Ford F-250 High Boy 4WD Front 2-4" Rear 0-4" Lift. N8014 Front Shocks. N8058 Rear Shocks. Velocity-Sensitive Valving: Adjusts automatically to different terrains for smoother rides across various conditions.