Susan,
Changing a clutch slave cylinder on a Sport Trac is not any different than changing one one on any other vehicle....pretty straight forward. I would thing any Explorer manual close to your Gen-1 Sport Trac would be as good as it gets.
I had a Popular Mechanics DVD that gives you access to the online manuals with all the updates. I got rid of my last Sport Trac in 2008 and don't recall where I got the PM manual DVD. The DVD just installs software that allows you access to a single vehicle, make and model, but it was very good at showing parts, wiring diagrams, troubleshooting, repair procedures, etc. I think it was only about $20 for the DVD.
Since I don't own a Sport Trac anymore, I did not install the software on my new computer, and have no idea were I even put the DVD....Sorry. :cry:
...Richard