Not best, but optimum Transmission?

Well, without getting into ocean levels and how they relate to automatic transmissions, I would be more concerned with finding a leak if I'm losing trans fluid. Understandably, transmissions and oceaneanic levels are affected by temperature which affect currents; which affect levels...oceans are a little more complicated than a 727, but you understand that your 2-3 flare means the pump is sucking air; not that your trans needs rebuilt. I think the op wouldn't understand that connection. And therein lies the rub. Debating fluid levels on a trans that doesn't even have a stop on the tube is like rearranging deck chairs on the Titanic. Full might be full but it isn't always full. Sometimes full is full and sometimes full is overfilled. I think Donald Rumsfeld would consider a "full" mark to be a "known unknown".