That bites!

You can use RTV for the trans pan instead of waiting on the gasket. Gray or black RTV are my preferred flavors, blue just turns to goo. Get both surfaces CLEAN, I like carb cleaner for this. Lay down a bead, put the pan in place and just tighten the bolts enough to get an even 1/8" gap between the pan and trans, filled with RTV. Let cure overnight, then torque bolts the rest of the way.