I've got a 2002 mtd yard machine that runs great as far as the engine goes but that's as far as it goes. When I put it in any gear it just sits there. The pulley on top of the tranny is moving and that's it. I've taken the tranny out and removed the bottom cover to see if there was anything obvious but that too went nowhere. Then I noticed a couple of things that really confused me. First the left side hub spin a freely on the axle shaft. Second, if you hold the ring gear the right drive shaft will move without any gear being selected. When I took the axle assy apart I noticed it has spider gears inside the ring gear just like a limited slip posi traction rear end on a car. There are no broken parts in any of the parts here but I can't figure why it won't move. Can someone please help me figure this out. Many thanks