The easiest way involves dropping the subframe, engine and Transmission as a unit out of the car then separating the transmission and engine just so you can get to the seal. That being said, how bad of a leak are we talking about here?
1997 Taurus GL - 3.0 OHV - The Project Bull
1998 Taurus SE - 3.0 OHV - SOLD
1997 Taurus GL - 3.0 OHV - SOLD