The rev limiter is a maximum that the PCM does not let the engine exceed regardless of gear. The individual rpms Jack listed are WOT shift points. This is where the computer tells the machinery to change which gear is being used, because of delays and such the actual shift can occur later and at a higher rpm. The rev limiter comes into play here because the shift points, in order to improve performance, are set as high as they can practically be. If the engine does not shift into the higher gear soon enough it can actually rev high enough to get caught by the rev limiter and cause trouble with the shift. That is why the general recommended gap between the shift points and rev limiter is about 400 rpm. The 400 rpm gap gives a better buffer for shifts that dont work perfectly.
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