FWIW, my '71 TR6 came from the factory with 90-weight gear oil in its OD
gearbox, when I bought it new in December of 1970.
The OD began to slip at about 20,000 miles, which I initially misdiagnosed
as slip in the Laycock diaphragm clutch, so I put in a lever-type Borg &
Beck. The OD then blew completely a month later while driving down the
interstate. Did the gear oil do that ?? Dunno. I cannibalized an OD from a
'64 TR4 and put mine back together, still with 90-weight gear oil. Still
working 16,000 miles later when I sold the car.
Karl
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