Triumph TR3 drawing

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Triumph TR3 FAQ page

Trouble finding GL-4 gear oil? (GL-5 is hard on bronze)

From the folks at Castrol:

Our Hypoy gear oil line has always been based on the military specification MIL-L-2104 and API GL-4. Our Hypoy C gear oil line is based on the MIL-L-2105/API GL-5 specifications. As these specifications were upgraded, so were our products.

Hypoy 90 was an API GL-4 product. If you need something comparable today, your best choice out of our line would be Hypoy 80W-90. Although it is a multigrade, it still provides the high temperature viscosity of Hypoy 90.

From TeriAnn:

I'm personally a great fan of Redline synthetic oils.  Redline MTL works great in a TriumphTR4 overdrive gearbox

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