Warden,

I would look up the trans at http://www.allisontransmission.com/product/series/index.jsp

And if I couldn't find it there or couldn't find the number on it to begin with I would contact them and tell them your situation... they would have someone who could tell you where to look for the model number and what and how much fluid to put in it.

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1985 300D Turbo ~225k
2000 F350 (Powerstroke) 4X4, SWB, CC, SRW, 6spd ~148k
1999 International 4900, DT466e (250hp/660 ft/lbs), Allison MD3060 ~73k