My 2001 Pontiac Montana transmission was parked on a steep hill(with the...

[itybtytityluvr]

...parking brake),when I left the? Transmission started pouring fluid all over the ground. I was in a big parking lot and it left a mile long strip about 3" wide.
What could have happened?
How much will this cost to fix?
It is an 01 Pontiac Montana mini van.

 

[Humveetech]

Or you can have it filled back to correct level & as long as you don't park on any steep hills. You should be good. Most likely a seal, which direction was the engine facing on the hill? Up or down

 

[Texas Wildman]

sounds like it is your seal. depending on how much damage it took. maybe 300.00