There is a small metal vent tube on top of the transmission case; but ATF fluid should never come out of this vent unless there is some internal problem causing it!
Are you sure it is not coming from some other location?
If the vent is clogged or plugged and when the fluid gets hot it will purge (vent) itself out whatever way it can.
If the fluid is getting overheated and and is overfilled, it could cause it.
The first thing I would check is the fluid level. Running in Neutral on level ground.
If it is way overfilled it could spill out the vent when the fluid gets hot.
_________________
Supporting Vendor and Moderator of LOST05 Jeep Liberty CRD Limited
Ironman Springs/Bilstein/Shocks
Yeti StgIV Hot Tune
Week's BatteryTray
No FCV/EGR
Samcos/ProVent
SunCoast/Transgo
Carter Intank-pmp
2mic.Sec.Fuel Filter
Flowmaster/NO CAT
V6Airbox/noVH
GM11 Bld.fan/HDClutch
IronrockArms/wwdieselMount98 Dodge Cummins 24 Valve