Problem one, maybe the differential input shaft is locked, not rotating. Check transmission/differential is free to turn with the wheels elevated. Disconnect input to differential and turn input shaft by hand. Hopefully input turns easily and wheels turn. If input is held, wheels will turn opposite directions due to differential gear action.
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1863, 1864, 48" and 54" mower decks, 54" snow plow, 451 snow blower, TracVac 580
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