Gather the essentials. How much Mobil 1 ATF fluid you need will depend on your tranny model, if you've changed out your converter, and if you may have upgraded your tranny pan. In my case, I'm doing the oil change on a 94 Z28 with a 4L60E. However, I have replaced the stock torque converter with a Vigilante 2800 stall and also have changed out the deep pan that would normally be found on a late model Chevrolet 4x4 truck with a 4L60E.