Put your hands in front of you. Spread your fingers out as far as they will go. Put the fingers of your right hand between the fingers of your left hand out near the ends of your fingers. Move your hands back and forth so your fingers hit each other. That is the stock cush drive.
Do the same thing only put your fingers down to where they come out of your hands. Move them back and forth. That is the T-Bird cush drive....

(Just the thought of everyone doing this is going to keep me chuckling for days...)