Hank here is more info:
The American Coleman Company did quality AWD conversions on many big Fords used in the construction, mining, etc. industries as well as in government service. But finding it on a small model is very unusual. Here's a diagram that was one of their advertisements.

http://i286.photobucket.com/albums/l...rdcoleman2.jpg

For service and parts if your friend owns it I'd suggest contacting Chuck Mantiglia of Chuck's Trucks in CT. He owns a Coleman F-7 and would have a line on any Coleman parts suppliers