Rounding out the Stage 3 EXP suspension system are 2.5 Aluminum Series rear shocks specially tailored for the 2019-2023 GM 1500. The 2.5 Aluminum Series shocks’ larger diameter offers outstanding performance off-road and a smooth ride on the street. Piggyback reservoirs ensure optimum performance by increasing the duration of consistent damping regardless of situation, keeping the shocks at a cooler operating temperature during heavy use. They also feature a unique internal Bump Zone that when used creates an additional 20% of damping force to help better control hard bottom outs. Their pairing with the ICON 2.5 EXP Series front coilovers results in balanced vehicle control from front to rear and an excellent overall driving experience for your Silverado 1500 or Sierra 1500.