Hypoid oil slowly attacks bronze and brass. I don't know if there is such in an 80 box. I could not get the correct oil as per owners handbook so played safe and bought Toyota.
I could not find the correct oil so tried to find out if there was any brass/bronze in the box but could not.
I don't know about oil specs but I think the magic word is "hypoid EP". This must be used where there are hypoid gears; no other oils. The 80 Land Cruiser main box uses a "general purpose gear oil" which I think is unobtainable. I ordered Toyota brand gear oil for my 80. I think the oil was fully synthetic gear oil.
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