If you take the shifter cover off you can probably see the input shaft bearings well enough to tell whether they are bad or not. That would be the easiest way to rule out the input shaft bearings IMO. However, to replace either the input shaft bearings, or the throw out bearings (pto & clutch), you're going to have to split the tractor at the clutch anyway. Here are some pics of what you'll see when you get in there. I prob have some better ones at the house, but I just put my 1365 (same as your 2-60) back together this weekend, so I don't have it split anymore.