It would have originally had straight 30 weight in the engine, 20, or 10 in extreme cold climates.
The transmission, differential (all a common oil fill) was 90 weight GL1 mineral oil. Not hypoid or EP lube.
You can still get 90w mineral oil, but it will slow the hydraulics down in cold weather. To simplify everything , what most do is run 15w 40 diesel oil in everything.
The steering gear also used 90 weight oil, but few will hold it due to leaky seals. A common substitute is to pump in grade 0 or 00 grease, aka "corn head" grease. It is thin enough to not channel away from gears, but thick enough to stay in with less than perfect seals.
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