When you say "Transfer case large", have you got a 2-speed case in your F15A? The single speed case originally fitted should, according to the Aust Army handbook, have 2 pints (1.2lt) of 90 grade hypoid oil, while the large 2 speed cases should have between 3 pints (1.8lt) and 3 1/2 pints (2.1lts), depending if a PTO is fitted or not. The manual says 90 grade is normally used "in temperate climates". The fins cast in the sides of the case aren't just for strengthening, they also cool the case.
As for sourcing the shims, have you tried Ross Prince?
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