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Hello. Welcome to Just Answer. Please allow me to assist you. Please allow me to ask a few questions: Do all 4 tires move freely?
Does the driveshaft try to turn when in gear (fwd or rev)?
Without seeing it, and assuming the transmission is full of fluid, this sounds like you do not have fluid multiplication from the torque converter/transmission oil pump, or, the fluid pressure being produce form the unit is being lost into the trans pan via a valve stuck open in the transmission. Before I did anything, I would get the vehicle towed to a shop; there, have the transmission fluid flushed out via a machine designed for this purpose.