All,
I am no expert on this subject but it looks, from the information on
the Vintage Triumph Registry web page, like you should use GL-5 rated
gear lubricant.
Even though GL-5 lubricant contains sulphur and phosphates, they do
not break down and do damage until they reach 250 degrees. As
differentials do not reach this temperature there will be no sulphur
and phosphate reaction. At least that's how I read it.
Kurt Eckert
Series III GT
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