well I'm over due on a transmission fluid change. I have a 2000 GT 5spd so I'm assuming I have the T45 tranny (why the hell does my Haynes say I have a T50 -D? ).
Should I go with Royal Purple ATF, Mobil 1 ATF, Amsoil ATF synthetic?
Whatever's cheap and follows manufacturer requirements.. it's not like fluid down there is doing as much as say automatic trans fluid, or rear end fluid, so just run what you're comfortable with.