My neighbor gave me an old YT12D Snapper riding mower for free to get it off his lot. The deck is good, the chassis is OK, and the twin cylinder B&S runs, so I would like to try and resurrect this old machine. The problem is with the transmission. BTW, this is not a RER "Forest Gump" mower. It does have the disk/driven disk drive, but then the driven disk goes into the chaincase, chaincase output shaft goes into transmission/differential unit on the left side, then through a couple of intermediate shafts with a mix of chain drives (two) and a dual-range gear slector. I some diagnosis. Here is the deal: 1. The chaincase works. The problem is NOT in the chaincase. 2. Spinning the rear wheels in high or low range makes the transmission shaft with the brake band on it spin. 3. The shaft with the brake band on it SHOULD be turning the shaft to the chaincase, but it doesn't. So I have isolated it that far. I pushed the tractor back out to the woodpile and strung a tarp over it. Tranny work will have to be a winter project. I am looking for someone who knows these trannys inside and can give me an idea of what to do next. The gang on Mytractorforum have taken a look but did not have an idea of what to tell me, and Snapper has not written me back yet. Anybody who knows the old LT12/LT16/YT12/YT16 "D" series transmissions please help.