You said nut on range transmission main shaft. That would be the pinion shaft and just tighten the heck out of it as it has to hold the spacer, carrier and pinion bearing tightly together. Lot of them work loose over time. If you mean the nut on lower speed transmission shaft, well you will get a hundred different answers on that one. I tighten it, back it off just a little, with cleaned threads and extreme Loctite plus the locking washer. Reason to back it off is those lower gears find a pattern and if you tighten it down tight you will get a noisy speed transmission and they will eventually loosen up again anyway even with the heavy spacers over time. On the oil circulation, I never drilled any hole in housing, just knocked the plug out of housing. It doesn't circulate as well as with the hole but it works fine and a whole lot of tractors are running around that way.
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