To Replace a Transmission Filter gasket and Oil 2006 Ford Expedition you will need basic hand tools.

Super Thick Auto Mechanic Gloves

10mm short and long socket

12 inch 3/8 extension

6 inch 3/8 extension

3/8 Ratchet

Oil drain pan (Amazon link)

Rags

Break Clean

Nm torque wrench

Safety Glasses

De-greaser

5 quarts of Mercon V automatic transmission fluid

Long funnel FloTool (click on pic for a direct link to amazon)