Yea, I am assuming you are reposting because you didn't get your answer on page 4.
Ok, here is my shot at it. I had a similar issue on my Super C last summer when I was using it. All of a sudden it made a horrific noise when letting the clutch out and trying to move. What I found was quite easy to fix. The clutch main shaft that goes into the transmission (see the attached picture. The guy has his right hand on it) has bolts and straps that hold it together. One of those bolts had backed out allowing the other bolt to carry the load but let the straps fly out into the torque tube. This created the grinding sound. I had to split the tractor at the front of the transmission to get at it, but even with loader I had to deal with, the job wasn't much more than a couple hours.