Vehicles with age or high mileage will settle over time. The RS999915 is a 2.75” lift that is tested on vehicles with new suspension components. To level the rear of vehicle, you can go with an a 2” rear block kit. Readylift makes a 2” block kit with u-bolts, #66-5002 and ARB/OME makes a Carrier Bearing drop kit, #FK29.