How far out of level are you? You could possibly use a Roto Tiller to do the job. Use it on the highest depth setting and strip only the sod off the entire area. Next drop the depth down and start cutting up the soil on the high side. Take the soil from the high side and use it as fill on the low side. You should only need to cut one half of the area and use it as fill for the low side. Somtimes you create more restoration work after using a bobcat in your yard from the tracks/tires and them tearing up the lawn. Good luck.