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If it's the British "transmission", that would be the primary case and that is engine oil.
If it's the American "transmisson", then I use Mobil 1 75/90 Gear lube synthetic. I have also used BelRay gear oil with good results. The synthetic is much less hygroscopic and isn't as affected by moisture. Change it every couple of years.
You can also glue a small, powerful magnet to the inner gearbox cover and pick up a lot of the wear-inducing steel bits. Those little neodymium/iron/boron magnets are just great. I also have a couple of them stuck on the back of my oil tank, one where the returning oil hits the tank and another near the bottom screen.
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Triumph old, Triumph new, any Triumph will do.
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