I use Super Blue Permatex. If you put a tiny bead of it on the gasket surface, it'll hold that baby in place while you bolt it up. Of course if you slop it on like toothpaste it's gonna slide right off the pan, BBB. Now those rubber tranny pan gaskets, those things are the shit because they hold the bolts in place for you!
I know you're not stalking me, Janien (probably spelled horribly wrong). I'm just a faster typer than you. It stems from me having a faster and lighter Chevrolet than you I think.