That very well may be it. There was a grinding noise during operation. off and on, mostly when the clutch was pushed in to shift gears. Stopped immediately once i engaged the clutch to move forward. Which, I thought was the Throw out bearing going out, like the delivery guys guess'd it was. He was the father and previous owner operator the the man who owns and runs that dealership now. So I figured he may know what he was talking about. However, I ran it a year, low low on transmission fluid, till I found out I had to check that separate from the rear end. Since mine is a 66, it does not share fluid between hydraulics and tramisssion. Soooo 2.5 gallens short was the tranmission, and the grinding more than likely was the gear grinding itself off. The noise stopped when I topped it off, but foam ran out, so i drained it, ran a gallen of diesel fuel thru it, and the next day filled it full of new fluid. The noise stopped, but by then so had the pto shaft, it was not turning any more, then the hydraulics stopped working soon after. Well, live and learn, you might say, but that does not help my pocket book, nor does it fix the tractor from my ignorance.