OK 90w, and 4.5 qts.for each??
Thank you for your responses.
Gary, Oh no, not "QTS"!

That would way overfill both the transmission and axle.

The oil capacity amounts and type specifications are listed in detail in the original
1942 Chevy Truck Owners manual that you can read through at your leisure. The lubrication type and interval info is listed starting on Page 31 and the "capacities" begin on Page 51.
Let us know how your work progresses.