Oil pressure sounds ok, especially if it is a well used tractor.
Pull the belt pulley or cover (whichever you have) and look in there for foreign objects, perhaps a ball has gotten loose from a worn bearing and is getting knocked around. That will end badly. A magnet on the end of a heavy piece of wire will work great for fishing around underneath the countershaft along the bottom of the transmission.
You don't say if the noise is under load or at idle or when traveling. An idling tractor in neutral with a weak cylinder and a transmission with some slack will make a rap whenever the weaker cylinder misses and the rotating assembly slows and then speeds up again when the next cylinder hits.
Forget about additives and look for an excessively worn bearing. 85-140 will quiet things down some more at the cost of a little power.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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