Congratulations you are the 10,751st person with this question. Sorry, no prize will be offered for a long while.
You're right, the cut and sculpted teeth are what put the glide in Powerglide (or is it the Power?). They create shift gates which encourage the chain to shift at a time that the next ring is properly lined up for smooth engagement.
BTW- this may be the single most frequently asked question here on BF, and IMO should be a sticky, along with some of the other very basic FAQs.
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