Its leaking from the front seal, which is between the pump and the torque
converter. Its not a "big worry", but it should be taken care of when time
and money are available. Read this to say you should plan to have it taken
care of before any long trips, and before next winter. The concern is that
the seal will only get worse, and eventually allow dirt and water to go IN,
while the fluid is not coming out. Also, it will eventually coat the
underside of your vehicle, and collect dirt and grime. It will also drip off
creating nasty marks in the driveway, if nothing else.
A quart in 300 miles is fairly significant, and that is what causes me to
recommend taking care of this soon. The transmission will need to be removed
for this work.
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