4.0 Inch Lift 2.625 Inch Remote Reservoir Package 2005-2016 F-250/F-350/F-450 Gas Only Rock KrawlerThe RK 2. 625 Remote Reservoir Shocks feature a fluted aluminum body that delivers a remarkable weight reduction without compromising strength. This makes it the lightest remote reservoir shock in its class, while also providing a surface area larger than many 3 bodied shocks, improving cooling efficiency. The fluting enhances the structural integrity of the aluminum cylinders, ensuring they are just as strong if not stronger than steel 2. 5 shock