2.625 Inch Rear RRD Remote Reservoir Shock 4-4.5 Inches of Lift 13-Pres RAM 3500 HD 4x4 Rock KrawlerThe Rock Krawler RRD 2. 625 Shocks fluted aluminum body gives the advantage of weight reduction without sacrificing strength. Which not only make this shock the lightest shock in its class, it also provides a surface area greater than most 3 inch bodied shocks. The fluting provides the structure required to ensure the aluminum cylinders are as strong, if not stronger than their steel 2. 5 inch counterparts. The shock bodies are also treated with a