727 Transmission leaking

I`ve got a monster leak from the 727 transmission in my Dart. It leaks when the car is just sitting. In 24hrs. it`ll create a puddle 6 inches in diameter. I`ve replaced the shift selector seal, pan gasket, tailshaft seal, speedometer O-ring, and filler tube o-ring. It still appears wet all around the pan, I replaced the rubber pan gasket with a cork one. I don`t know what else to replace? Can the front pump seal leak with the car just sitting?