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The only high friction areas are the gear tooth faces. And even with that only 2 gears are contacting at a time. One on the main shaft and one on the counter shaft. So the heat created from that is minimal and that's the highest heating point in the transmission. Everything else is roller bearings that are very low friction points.
If you think of it as a whole. Heat will transfer to cooler contacts how a heat sink does. So for example, if your in 4th gear for 50 miles then 1st 2nd 3rd 5th and 6th are just rolling around in oil not increasing in temperature. While 4th gear is getting hotter than the rest, the heat is distributed to the oil and other metal parts. So if you have more parts not increasing in temperature vs ones that are, then your not going to be gaining temperature very quickly at all.
Also if your 2ss is like mine then you have a transmission oil cooler up front dissipating heat even more
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