I know this is an old thread, but I have one little tidbit of information to add (since I just accomplished removing the box myself after struggling with it for forever...). I didn't have to mess with motor mounts and such, so this is what worked for me:
1. Remove the bolts on the steering column mounting bracket on the dash and unscrew the turn signal wiring (and remove the plug)
2. Remove the four bolts on the square flange that holds the steering column to the box
One of the bolts will likely be hard to remove. I just unscrewed it as far as I could and then cut the head off with a hacksaw blade, then removed the threaded stub from the box.
3. Remove the pitman arm from the output shaft (I used the pitman arm/ TRE puller from Harbor Freight, tool #1752; it worked like a charm):
http://www.harborfreight.com/tie-rod-and-pitman-arm-puller-1752.html
4. Remove any hoses that are in the way of the bolt heads. I don't know the name of it, but I had to disconnect one end of one of the lines.
5. Disconnect the hose connected the 45 degree brass fitting on the bottom of the (?) injection pump, and remove the fitting as well.
6. Remove all the bolts holding the cover on the box. **NOTE** This is what took me FOREVER. One of the bolts has a countersunk head and is removed with an allen wrench (can't remember the size) and may be hard to see. It's located directly behind the 45 degree fitting mentioned above, and if you're looking at the box from under the truck, it's in approximately the 10 o'clock position and looks like this:
7. Crack open the cover and drain the box.
8. After all the cover bolts are out, remove the cover.
9. Remove the sector shaft (I think that's what it's called, but don't hold me to it); this is what is keeping the steering column in the box. It helps to tap on the output shaft with a deadblow hammer during removal.
10 Remove the steering column from the box. I couldn't remove the column from the truck completely as the square flange on the column won't fit through the hole in the firewall. It probably comes off somehow, but I haven't figured it out yet.
11. Once the column is removed from the box, the bolts holding the box to the frame can be removed and the box can now be removed from the truck.
Anyway, hope it saves someone else from wasting unnecessary time in removing the steering box.
-WRM