Hi guys. I am new on the board.

I have a 57 Tbird with a 312 and a Fordomatic transmission. The transmission pan gasket is leaking and I would like to replace it. It is currently running TYPE F and it runs great. I have read that sometimes a fluid change will cause the transmission to start slipping. The fluid looks healthy- nice red colour, no burnt smell or dirty. I believe the tranny was rebuilt in 1992 as part of a high quality restoration. Is draining the fluid and re-using it an option? Also the replacement gasket is now rubber as opposed to cork. Do I still need to use an adhesive on the pan side of the gasket or install it as is?

Thanks