John, the number on the serial number tag is 239-055 692. Does that sound right? After running it on sunday I think the noise is coming from the clutch/bellhousing area. The cab magnifies it and makes it sound like it is coming through the tranny/diff? It seems the worst around 900 rpm's and around 2300-2400. When you push in the clutch when the tranny is in neutral you get a pulsation out of the pedal. I put the tranny in the 3, 5, 6, and R2 range and the O/U in over and got under the tractor to listen and the tranny and diff sound quiet, I even put my ear against the bottom case and I couldn't really hear anything. But when I layed under the clutch and bellhousing are you can deffinetly here a growl, but it comes and goesn it is not constant. Also, the input shaft gear on the tranny is slightly out of line with the output gear from the o/u. I am not sure if they are just worn and that is why they are not lining up or if I can adjust that somehow and if that may be causing some of the growl also?