1999 Jeep Laredo transmission problem

My engine is leaking oil, except everytime I checf the oil level it is full, last week my transmission started missing shifts, I checked the fluid, and it was allmost empty. I filled it up and it is really leaking out, I cant find out from where, seems like between the engine and the trans, the fluid is black, like old engine oil, the trans fluid on the dip stck is red like its supposed to be, any ideas?