Here is the wiki on the W series Toyota transmissions with the gear ratios listed.
http://en.wikipedia.org/wiki/Toyota_W_transmission

More thinking out loud.

I have a friend who is pretty deep into the Toyota 4x4 community here in CA. His brother owns a shop that builds trucks and crawlers, and he's worked for machine shop build transfer case gear sets. If we (the Mercedes community) were able to work the kinks out and we became a market for an adapter plate, I bet my friend could put me in contact with a machine shop that would be interested in making the plates. I'd think with 2 markets, Mercedes people wanting the transmission, and Toyota people wanting the engines, there would be enough of a market that this would pay off.

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