is castrol 5 atf combatible with my 2002 mitsubishi diamente, if not what is?

i am going to replace the burnt dirty atf in there now and change the external filter...going to drain it or suck it out but wont to clean the bottom of the pan so will most likely drain. it feels like it is slipping on me from time to time and am very worried. surges betwwen 2000 and 3000 rpms...mow it more of a slip i believe.