Technical GM Rear End "ID"

For someone that knows more about rear ends than I.
The casting number:
3725899
With a model number that is E223?
From what I've read its maybe a 55-64 rear end?
If someone could confirm or denie this that would be awesome!
It won't let me get any pictures on here, but its a 10 bolt, with a plug in the back and a slight hump resembling that on a ford 9in. Any help would great! Thanks, Ethan

 

E223 would be May 22 1963

 

It may be an Olds/Pont. rear. Are the axle tubes oval and tapered? Is the axle flange round and bolt holes wide and narrow (top and bottom width apart) ? A few more pix would be great, also roughly measure size of ham Olds/Pont is about 10+ inches.

Pat

After re-reading your post Olds/Pont did not have a fill or drain plug in back. Chev 55-64 would be the next best guess.

 

Ethan...casting number of the center section confirms that it is a 1955-64 Chevy drop out center rearend. Could have been out of a 1963 Impala or Nova. In looking at the pic...the top bracket and panhard bar mount location look like 1963 Impala..

 

Thank you for all the replies! Very helpful.