Need help with casting numbers on a T-10 Transmission

I have a T-10 Side Loader transmission that I don't know what it came out of or how old it is. Looked around online but I couldn't find anything. The casting numbers are as followes:

T10B-1 Under that is has W.G. Div W-1

On the tailhousing:
T10B-7? (it's hard to see)
Q-1

If anyone can help that would be great!
Thanks,
Mike

 

http://fiedlerh.home.att.net/BW.htm

Lots of info here

 

awesome stuff, thanks for sharing