Originally Posted by tclederman
Is this the Shop Manual excerpt?
http://chevy.oldcarmanualproject.com/shop/1948_51truck/51ctsm0005.htm
90w mineral oil or multi-purpose gear oil/lubricant

I'd drain it, rinse it with some kerosene, then rinse a little with the gear oil, before filling with the gear oil.

See highlighted portion. Says NOT to use straight mineral oil. Perhaps some nomenclature there I don't fully understand.




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