Sounds like your Turf Saver rear end has failed. They have a clutch pack that wears out, and unfortunately no service packs are available. Best and cheapest option is to replace the rear end with a later model unit. Any unit from 2011 and up will work, but you will also need the later year axles as the splines are different. The later year rear ends are a locked type and very stout! On another note, I have a turf saver rear end with over 7,500 miles on it still working like new! I have it as a spare, and believe that frequent oil changes (3X's a year) has extended its life!