Tech, I kinda think Al might be right on the ID, I really can't tell from the picture posted. This arangement was pretty popular through the 40's for a lot of drive axels.

With my fondenss of old MOPARs (yes Bob, I'm out of the closet ) I definatly recoginize "type" of axel. Chrysler Corp used them through 1961.

The puller Al shows is EXACTLY the one I was talking about.

My own prefered method for dealing with them is shown below.

1. Raise car
2. Remove drive shaft
3. Remove brake hose and shocks
4. Remove axel U bolts.
5. Remove Axel
6. Install newer Axel with removable brake drums, lower gears and a Posi.
7. Sell original rear to someone doing a restoration or take to nearest recycling yard.