Your front axle looks very much like the Corporate GM axle found under WW2 era G506/G508 trucks and Korean G749 trucks. I believe Eaton had some business connection with GM. Do you know the gear ratio? I will be very interested to see the internals of your axle when you start the restoration process.
Here is a representative sample from a G508 (AKA CCKW):
http://www.ebay.com/itm/like/152819067905?vectorid=229466&item=152819067905&rmvSB=true
