Well it looks like the transmission on my 1 year old Troy Bilt went out. I had just started the back yard when I heard a loud bang and the mower stopped moving forward. The drive cable is not broken and the clutch is engaging fine. When I engage the drive handle it makes a loud grinding noise, jerks forward a few inches and then stops moving until I release the handle and do it again. The mower has seen pretty light duty. My yard is less than half acre, flat for the most part. Nothing but grass; no stumps or rocks or any of that. It has a 2 year warranty but now I have to find the reciept from Lowes for a warranty claim. This is a really nice mower with the Honda engine so, I hope I can get it fixed. No telling how much a new transmission would cost, I'd probably just buy a new mower.