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 - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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