SM-330
Not sure this answers your question, but you do have to change all the internals when changing from one ratio to the other. I also recall something about the front bearing cover; I unknowingly used bolts that were too short and pulled them out of the case on launch!
Went to a 400; wish I had stayed with the 3 speed.
If this is not useful, please explain further and I'll try to help.
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