So I went ahead and just dropped the crossmember, wasn't as scary as I thought it would be. I guess the adaptor pan gasket was there the whole time just was sealed to the top. I didn't bother scraping it off to put a new one on. Put everything back on, and one bolt of the crossmember stripped it seems; it just spins never tightening down all the way. I gave up for the day after that, will fill it up and go through the arduous process of checking for correct fluid amounts tomorrow.