WARNING: This page is about a different car, the 2006 Mercury Milan, 2006 Lincoln Zephyr, and 2006 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
The transaxle has the following parts to prevent external fluid leakage:
Gaskets
Lip type seals
O-ring seals
Seal rings
Seal grommets
Thread sealant
Fig 1: Exploded View Of Transmission External Sealing