I just received my Isuzu Bighorn shop manual today and it has a TREMENDOUS amount of information, including details on the 5-speed tranny (for the 6VE1 no less) and both the standard and TOD transfer cases. It even includes all the pin-outs and signaling for the TOD system as well. Very nice manual, very nice. I bought it for info on the 4JG2 and 4JX1 turbo-diesels, but it has a wealth of info.

I'll be sharing the info once I cull through to the good stuff, which unfortunately may not be until after I get back from Mexico. In the meantime, it looks like a 5-speed for us should be very "off the shelf".