You may find the boardgame "Patton in Flames" useful for your Mod, its availible from Austrailian Design Group (ADG) and should have all the deployment info you want (it continues the war after the fall of the Reich, as you'd like your mod to do).
They also do Another what if game "America in Flames" with the victorious Axis invading the Americas
The American tanks in the battle of the Bulge film were chaffees, aparently a few did see action in the actual battle. Of course the vast majority of the Allied tanks in the Bulge would have been Shermans
[ May 30, 2004, 01:11 PM: Message edited by: munkee ]