2004 Chevy Cavalier Clutch pedal went to the floor

Here is my situation.
My clutch pedal went out and was stuck to the floor. After doing some research I replaced the Master cylinder and also the line that connects to the slave cylinder. I bleed the line and got all the air out of the line. I had pedal for about 5 min then lost it again. Also it appears to be dripping fluid from the bottom of the tranny casing. Is this the slave cylinder that has gone bad? And I understand I need to remove the transmission to replace it will the transmission unbolt from the engine and drop out or do I have to remove other items? Also should I rebuild my clutch while I have the engine out as I have 80000 miles on the car.
Thanks
Reuben