Should I gasket seal on transmission pan?

Sure, i have pulled pans glued to transmissions with sealant many times and there were never puddles under them. But why would you need to when there are the rubber over steel gaskets mentioned available that go on dry and come off as easily? Just make sure the pan is laser straight, tap down high spots with a mallet over a straight edge like the side of a square punch and torque to recommended spec, ie, 15 inch/lbs.