I had a 1964 4000 with that tranny. Didn't seem to matter to me which gear. But I didn't do what you are doing.
What you have is friction (gear to gear power losses transferring power primarily) in the process of doing the work which generates heat. There is no place for the heat to be dissipated other than in the oil which is transferred to the steel housing and radiated into the air from that housing that doesn't even have cooling fins. The tractor doesn't have a separate oil cooler located up front of the radiator like larger or some newer tractors to get the heat out and maintain cooler oil temps.
Steel is a very poor thermal conductor like alum or copper (think cooking utensils ...alum pots, copper clad bottoms type thing). The heat is generated at your rpm rate but not expelled as fast as it's generated.....result oil-housing gets warm. No biggie. If you can hold your hand on it for 10-15 sec, you are below 70C which is well below the temp where the oil starts to break down.
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