Eibach 07-15 Toyota Tundra 4WD Rear Pro-Truck Reservoir Shock (0-1.5in Rear Lift)Eibach's PRO TRUCK Reservoir shocks are designed and engineered to improve the off road performance of your vehicle. Unlike traditional shocks, resi shocks use a remote reservoir which allows additional fluid to dissipate heat more effectively reducing shock fade. Resi shocks also allow for more responsive performance by reducing aeration (foaming) of the internal fluids by separating it from the nitrogen gas charge. Warranty Installation Instructions