I would guess a stuck clutch, but am not sure which one.
Certainly if one of the over-running clutches is stuck the
transmission will lock up (be in two forward gears at once) when
attemping to roll forward.
What exactly is wrong and whether or not it will fix itself if you get
it to move I cannot say.
Could also be a stuck band.
Still should not kill the engine as the fluid couplng or torque
converter allows slip at idle. Don't remember if that tranny has a
torque converter or fluid coupling (torque converter I think), but I
don't know why it wouldn't work the same way in forward as reverse.
Even stuck brakes where the driveshaft cannot move shouldn't stall the
engine.
Peter
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