97 Gl Tranny Problem?

First i want to introduce myself and say hi. Next i need to foind out what is happening to my car. I was going up a pretty steep hill last friday with the car in first gear. I get to the top and notice that there is tranny fluid pouring out. So i back it down to a flat spot and refill the tranny with fluid then hurry to my tranny shop. Get out look under the car not a drop dripping. First i get the answer that it is the front seal and it will be $500 dollars to fix. Then i drive it home cause i didnt have the money and he said that since it isint leaking right now then it would be safe to take home. Get home and still not a drop. So i take it to a different shop and tell the guy wht is happening and he says the there is a pressure valve in the tranny and it may have opened up when i was going up that hill and poured out the fluid. I need to know which one of these are to be more likely and if there even is a pressure valve on the tranny. Thanks in advance and hope this isnt to much of a newb question.

I think you just over heated the TRANNY , an it spewed out the vent,, An just where in sam h#ll where you that you had to go up a hill in 1st gear ???????? , sounds like kid stuff to me

Oh sorry that i didnt mention that i live in the mountains of north carolina. Didnt figure i had to say that just to get a straight answer and not a smart ass immature answer. So the next time you jump to your little kid answers get your facts staright.

And on a side note if you can get past your ego anyway i can stop this from happening again?