I'm not sure but I think the G series were used with carb'd 22r's only. I can't remember the exact reason why they're weaker, maybe smaller bearings or something to that effect? As long as you don't throw a 350 in there or run gigantic tires you should be ok. I don't know how the ADD works so I can't help you there.

IMO, I would keep hunting for a W56, but if you gotta get that tranny, just remember to do all the checks Kewlynx posted earlier.

If you have the auto tranny and associated electronics still in place, pulling your solenoid connections should do some weird things.

When you pull the auto, your gonna disconnect all that stuff and tie it off. You can remove the small auto ECU as well. The only wiring you'll need to mess with is for the nuetral start switch, reverse and 4wd indicator lights.