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I would say that the zippy noise is the clutch solendoids redirecting the flow back to the clutches. They turn on and off several times a second to get the correct shifting firmness. Auto trans gears are always meshed, there is no sliding past one another. Also, I don't believe that the trans shifts in neutral when coasting. What you are probably noticing is the lock up converter disengaging. I have noticed that if you leave just a tiny bit of foot in the throttle, it will stay engaged.
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