My guess is that somewhere in the life of the donor tractor it had the ring gear replaced and it was replaced with the gear that was used on tractors up until the 404 series. If the ring gear is not in like new condition you can assume that the tractor was run with that ring gear not causing problems.
Check the tooth engagement of your drive in the replacement ring gear. It will most likely work just fine as long as the ODs of the ring gear is the same. The tooth engagement is pretty loose between the drive and ring gear and it s not uncommon to find a couple drives with different amount of teeth being used on the same ring gear. That is the case of drive number 1939109. That is a 9 tooth drive that was replaced with a drive with 10 teeth during the production run of the 656 tractors. There was no change in ring gear when the drive was changed on those tractors.
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Today's Featured Article - History of the Cockshutt Tractor - by Danny Bowes (Dsl). The son of a very successful Toronto and Brantford, Ontario merchant, and himself quite an entreprenuer, James G. Cockshutt opened a business called the Brantford Plow Works in 1877. In 1882, the business was incorporated to become the Cockshutt Plow Company. Along with quality built equipment, expedious demand and expansion made Cockshutt Plow Works the leader in the tillage tools sector of the farm equipment industry by the 1920's.
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