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Originally Posted by cody
Huh, I didn't realize you could have dog engagement on helically cut gears.
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The purple ring has the dog teeth on it, and it engages in the side of the gears. The actual gears can be cut any-which-way, since they're always meshed.
Very good description, including how synchros work, here:
http://auto.howstuffworks.com/transmission.htm