Thanks for the replies, and I certainly don't mind the longer posts. In fact I look forward to them. It makes it feel more like a discussion.
So, out of curiosity I fired it up again this evening after work and tightened the mounts just to see if it would change anything. That's when I realized that the rear iso mounts are missing the upper rebound bushing as well. Whoever did the "fix" wasn't paying much attention to detail.
I also watched the driveshaft at low idle and I can see it moving outside of the centerline quite a bit. That rag joint that is spanning the distance where there should really be two joints is deforming and causing the whole driveline to vibrate.
Let's just all breathe out a sigh for the "previous owners" out there. It's a wonder these tractors held up this long.
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