727 Transmission leaking

I think I`ve finally got this thing fixed! I went to the dealer and bought a new "reusable" pan gasket which is made from hard plastic. It`s about 1/8" thick and has a dual ridge on both sides. I used this gasket in conjunction with the sealant (The Right Stuff) as recommended by Dart-swinger. I ran a bead between the ridges on both sides and then installed it quickly, torquing the pan to 13 ft.lbs.. So far so good.