WP - MR2Race posted this earlier.... Sounds like he was on the team. The link is below....
FROM A POST BY MR2Race "On a few of the Protype Ford GTs that were used for track development.
I relocated the vent to a higher position. And that helped but did not completely fix the oil spewing about. The elegant solution is a breather vent kit.
I have a problem understanding how a trans cooler will help this oil out the vent problem.For a street driven car.
Yes a cooler should be installed on a track driven car.
But for the street I am not convinced it is required.
There is a method to define if a car needs a cooler installed. Monitor the gear oil temptures. This is the only definitive way to know.
I can tell you in development testing. Extensive gearbox testing was performed
(most of it with my data systems on the cars). And there were never any trans over temp issues with street driving. Even in Death Valley where the air is hot. And the road is begging the driver to triple the speed limit.
The only reason Ford racing has a cooler to sell. Is based on temp data we collected in extended track testing."
http://www.fordgtforum.com/forums/showthread.php?t=985&page=5&pp=10&highlight=transaxle+vent #42