What causes AT transmission fluid to come out of the transmission breather at 75-85 mph?

2000 HYUNDAI ACCENT
138,000 MILES
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WALLACE42
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-Flushed and refilled AT Transmission with Dex/Merc
-Transmission is not overfilled
-Checked for clogged oil cooler
Jun 25, 2012 at 12:56 PM
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MHPAUTOS
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When you check the level does the oil look aerated at all?
Jun 25, 2012 at 12:58 PM
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WALLACE42
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No
Jun 25, 2012 at 1:09 PM
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KHLOW2008
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Overheating of the fluids would result in that.
Jun 25, 2012 at 5:12 PM