He could try rotating the upper shaft manually with the engine off and the transmission in neutral. If the coupling is coming loose, there is probably going to be some free play. If the coupling is OK, it should be pretty solid.
If the trouble is there, I wouldn't expect the noise to be much louder with the cover off. So I guess it is on open question whether the louder he is hearing is enough louder to prove it is from inside the transmission.
So far, we haven't talked about whether there could be a noise source related to the PTO. I'm assuming this whole situation is going on with the PTO turned off, which eliminates most things PTO related.
I'm inclined to think a chip is imbedded in the oil slinger gear.
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Today's Featured Article - George's Fordson Major - by Anthony West (UK). This is a bit of a technical info to add on to the article about George's Major in the "A Towny Goes Plowing" article. George bought his Major from a an implement sale about 18 years ago for £200.00. There is no known history regarding its origins or what service it had done, but the following work was undertaken by Harold alone to bring it up to show standard. From the engine number, it was found that the major was produced late 19
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