Upon further investigation, the AR-5 is based on the 15X series of Aisin transmissions. Apparently the bellhousings for these will all interchange, so it should be possible to mate it to the 3.5l Isuzu.

More info here: Link

Now, can an adapter be made to mate the TOD to the transmission and is the output shaft of the trans the same size/splines as the TOD?

Does anyone have size/spline info for the TOD?