Rear Block Kit; 4 in.; For Models w/2 Piece Driveshaft; ReadyLift OEM style rear block kits are now available for model specific applications. The Rear Block Kits will safely lift the rear of your truck and additional 1 in. -3 in. Based on OEM designs and never made out of light weight extrusions, our 1 in. Toyota and GM blocks are made of cast iron and our 3 in. GM blocks have Anti-Rotation ears built in. The Ford Super Duty 4 in. blocks have Integrated OEM style bump stops. These kits will put the rake back into your truck for hauling or towing and are designed to work in concert with your ReadyLift Suspension Leveling Kit. Comes with a Limited Lifetime warranty.