F-150 NX2 Nitro 2" Rear Shock 1973-1979 / 1997-2003 (BDS85850)Features Vehicle specific valving for better control Pressurized nitrogen charged twin tube design 10 stage velocity sensitive valving for adaptive dampening Dual welded ends for increased strength Large 1 3 8 inch fluon banded piston and self lubricating seals 14mm hardened chrome shaft to resist rock chips and corrosion Includes polyurethane bushings and metal sleeves for easy installation Designed to work with 4 inch lift kits Durable metallic