FWIW ford uses ATF in the manual trans and t-case # 7 Member Join Date: Sep 2010 Location: Fayetteville, GA Posts: 118 Changed mine with 809 miles on it, put in Mobil 1 ATF. And yes I know but I'm weird like that. Im going to wait till i need a clutch to do my tranny oil. # 6 Moderator Join Date: Mar 2009 Location: York, PA Posts: 5,796 also the fact that manual trans don't create near as much heat as autos do. 5 speed manual Tranny oil change. Drivetrain Tech General discussion of drivetrain for the Ford Ranger. Community Links Go to Page. # 1 Member Thread Starter. Join Date: Mar 2011 Location: Ste-Anne-des-Plaines Posts: 18 5 speed manual Tranny oil change. Log in or Sign up. I was also told at AutoZone that I cannot use ATF, that would also hurt my tranny. Somebody said something about "Well, if you mean 'gear oil' as in tractor oil, then thats wrong, you need Mercon.