1991 AWD diagram service manual in digital format

Hi there all,
I just bought an old AWD Caravan (in Sweden where I live) and found out the AWD isn´t working. I went out on a muddy field to work and got stuck. It´s an old bugger and I try to repair my cars (all American - this is the first without a V8) by myself since it saves a lot - not time but money ;)
1) I´m looking for a service manual for both the car, Caravan 3.3 AWD 4spd auto, and a specific for the AWD system. Does anyone know where to find it?
I´m not only a fan of American cars, I´m also a computer geek and would love to get hold of manuals in PDF-format.

2) I´ve used this forum to get info for my Buick RM estate -95 and got a good set of links to other sites for the Buick Roadmaster/Chevy Caprice/Impala SS. I wonder if any of You Caravaners/Voyagers have any good links for my Dodge Caravan too?

3) Are there any good website that lists model Years/spare parts reference so I know what used parts I can use, since I live in Sweden used parts aren´t always available for just my model Year.

Thanks in advance
Benny Lloyd Willner, Sweden