Jack is much more the Dual-Range HydraMatic expert than I am, but ....
A. If the front clutch failed "engaged" and the front band was operating normally the front unit would be trying to be in direct drive and reduction mode at the same time. Assuming normal operation of the rear unit I would think the transmission would either lock up or the front unit would disintegrate once you left idle and the torus started to work.
B. If the front clutch failed "disengaged" and the front band was operating normally the front unit would work normally in 1st gear. When 2nd gear should engage the front unit band would release, but because the front unit clutch is off no power would be transmitted through the front unit, resulting in no power transmitted to the rear wheels.
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My Pontiac is a '57 GMC with its original 347" Pontiac V8 and dual-range Hydra-Matic.
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