A 46 half ton would be an EC 101 or 102 depending on wheelbase. A 1940 AC through 1946 EC use the same axle housing.
The left hand flanged should be stamped 41. Right hand stamped 42. It would be a hypoid torque type. The carrier should be casting 3657339. 37 teeth on ring gear, 9 on pinion for 4.11.