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 - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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