EE0612

1947 3100 rear end
E = 1947
E = 3100
06 = 6th
12 = December
http://www.1954advance-design.com/chev-specs/1947-Chevrolet-t-ser.jpg

I think this is a different length torque-tube than used in 1954.
The 1947 rear brakes would be the 2-adjuster Huck-style brakes.

You might want to try to ID the transmission - post code/codes here.

How long has the present owner owned the truck?