Ok I have been using this guy hard for some years now. Something has finally let go... My son was moving some dirt with it and said it was moving fine, got off tractor, got back on engaged 1st gear moved a foot then it stopped moving... We towed it back to the garage and inspected a couple things... Both shears pins are not broken, driveshaft spins when in gear ( tractor axle up on stands ) but drive wheels do not spin. One thing I notice, while rear wheels up, I rotate one side forward usually the other side will rotate in opposite direction. That does not happen in this current situation. So right now I think something in the rear end let go. Any thoughts would be greatly appropriated...