I was just looking at my owners manual for my TR4A. I saw the section
regarding lubricants. The book recommends the same lubricant as the
differential! Hypoid 90, etc. Such as 90/140 EP.
I'd think that modern 75w-90 gear oil should be a good match. As some
people have pointed out, the GL-5 may have a negative impact on
the brass/copper parts.
Does anyone have a reference to the inadvisability of using GL-5
in our transmissions? Everything I have heard is hear-say. I am looking
for someone who REALLY KNOWS what the GL-5 will do....
-Tony
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