May 10, 2020 · Now by using the gear ratio formula we looked at earlier, we can determine the ratio across the gears. The first gear set is 30 over 10 or 3 to 1. And that the ratio across the second gear set is 40 over 10 or 4 to 1. This information can be used to determine the ratio across the entire series of gears. Driving the Super 10. 10:58. Operating a heavy-duty commercial vehicle with Eaton's Super 10 manual transmission. Includes information on proper shifting.