The wear on the ring and pinion (bevel gears) has been long in the making. To me it is evidence that the "replaced gears" was a patch job, not a rebuild. I would find a donor rear end and swap it out. Or buy the gears and repair it correctly with new bearings as needed. One will cost more in labor and effort, the other has a bit of risk as you will need to look at the donor with a jaundiced eye to be sure you don't have more issues. I really like the 300 tractor, and yours is becoming family(I think). Jim
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