With a 4" Lift the manufacturer should have provided a either a sway bar drop or a link extension solution for making the factory sway bar links work. Stock links will work if these are already installed. If custom links are needed they can be made. To measure Take a center to center measurement, from the center line of the axle mount to the center of the sway bar, with the sway bar sitting level and the vehicle sitting on a level surface. With these measurements and the vehicle application SuspensionMaxx can make a set to fit almost any lifted application. Feel free to call us at 1-800-358-4751 if any questions.