Walked out to my car this morning and was mildly shocked to see a big pool of transmission fluid underneath it. Upon further inspection, I discovered that the transmission pan is dented in on the passenger side and it's slowly dripping out from the seal at that location. I went on a camping trip over the weekend and ran over a big rock which I imagine caused the damage. How easy/expensive of a repair is this? A new gasket is cheap but I'm wondering about the pan also. The car is a 1994 Mercury Sable GS with the 3.8 engine.