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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