Hal: Some of the last 450s had the clutch type PTO. If the PTO looks same as your SMTA, then it will be planetary. The clutch type PTO look quite different.
Either way the parts are not big dollars to fix. Getting someone who knows what he is doing will cost you more.
You can remove those units, either type and continue to use the tractor for draft jobs. You don't have to drain transmission-rear end, just park the tractor with front wheels about 2' lower than back. Remove the 4 bolts that hold unit in place, then it will pull right out. If your going to continue to use tractor while PTO is being rebuilt, there is a short shaft and two couplers you must remove. They are held in place by PTO, and will slip out easily. Then cut a piece of 3/4" plywood large enough to cover hole. Drill 4 holes matching the PTO mount bolt pattern, then bolt it in place with shorter bolts.
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