I would start by checking the spiral pins in the driveshaft, not uncommon for them to break. If you look in the back of the tractor you will see the rearend and the hydro pump, the pump will have a shaft sticking out the back that should spin the same rpm as the engine, if it's not spinning at all or spinning slower than the engine then it's definitely a broken pin. The spiral pins are special so you can't use a regular roll pin and don't use a bolt because it will make the rest of the parts wear faster.
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