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Let me clarify what I said. If the leak is audible over the engine noise, it would be a BIG leak, which, to me, would mean the shifting would be noticeably affected, which did not sound like the case here?

I was thinking this after I re-read your post. If you can hear it over the engine at highway speeds, it is not a vacuum leak. Alternator bearings? Take the belts off and sping them by hand to see how noisy they are.

Vacuum valve/lines on the IP?