I had the most luck fixing my lawn ruts by waiting, letting it dry out until just the right day when the ground is semi-soft, not soupy and not dry, and just walking beside the ruts, pushing the displaced turf back where it goes with my feet. Then a day or 2 (or 5) later when its dry enough to drive the tractor on without making worse ruts, donthe same thing with the tractor. Drive beside the ruts, right on the edge, and let the weight of the tractor tires push the remaining displaced turf back where it goes. What remains is either no rut, or a very small mark that can be easily filled in without calling truckloads of fill dirt.