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There is a vent hole on the rear of the transmission tower that vents the backend . The vent hole is around 3 sixteenths in diameter and located near mid way down the rear of the transmission tower below the shift lever . There is a good chance that the vent is stopped up, painted over and not visible . There has been pictures of this vent pictured here in the past by me and Mitch . Pressure can build or this vent would never been put there by Ford .