Chevrolet Performance ZR2 Rear Long Travel Dynamic Suspension Spool Valve (DSSV) Shocks are designed and tuned specifically for off-road racing by Chevrolet Performance and Multimatic. They provide up to a 10% increase in overall rear suspension travel on 2017+ Colorado ZR2 models and feature a 16mm diameter rod for higher side load, Viton seals to handle high shock temperatures, solid Heim joint lower mount, and optimized Spool Valve tuning. Includes both rear shocks and all required mounting fasteners. Fully rebuildable through an authorized Multimatic DSSV dealer. Chevrolet Performance recommends use with the Long Travel Leaf Spring System (P/N 84402368
), Rear Jounce Shock System (P/N 84422546
) and Jounce Shock Striker/Leaf Spring Mount System (P/N 84422116
) for optimum off-road performance.