Hy RobbieWright, a ratio is the relationship between two gears, in the case of a differential, it is the relationship between the pinion gear [ input at driveshaft ] and the crown gear [ output connected to axles ] if the pinion has 6 teeth and the crown has 36 teeth, divide the pinion number into the crown number in this case 6 into 36 equals a 6:1 ratio, hope that helps.
