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Redline MTL 75w80 gear oil will probably work fine. It's a little lighter, and works nicely in cold weather, but it still has good friction properties to keep the synchros happy so shifts are smooth. I had good luck with it in an older Audi and an '89 Tercel 5-speed.
Seems like an advantage of using coolant to influence trans oil temp is that it should also function as a transmission cooler in hot weather.
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