I opened up the transaxle! The layout of the parts inside is a little different than I imagined.
The ring gear is a largest spur gear and it's riveted to the differential housing, acting as an endcap.
It will be difficult to remove that gear to replace it with the 36 tooth sprocket. But if I can drill out the rivets, I think I can use those holes to bolt the sprocket to the differential housing.
The shifter plate has square slots, so I'll have to make my own shifter plate to interface with the pins I want to press into the drive pulleys. At least I will be able to use the arm that slides the shifter plate along the shaft.
There are also bevel gears in there that I need for the water jet project. All in all, a pretty good haul.
I also measured everything inside the casing, so I can now work on finalizing the front end.
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