People change gears, so getting a ratio from a post is like playing craps, you get nowhere. The most accurate way would be to open the backside of the differential, and count the number of teeth on the ring (larger) gear. Then, count the number of teeth on the pinion gear (the gear that the driveshaft attaches to. Once you have those 2 numbers, get a calculator and divide the number of teeth from the ring gear by the number of teeth in the pinion gear. This way you know exactly what is in your car.

People change gears, so getting a ratio from a post is like playing craps, you get nowhere. The most accurate way would be to open the backside of the differential, and count the number of teeth on the ring (larger) gear. Then, count the number of teeth on the pinion gear (the gear that the driveshaft attaches to. Once you have those 2 numbers, get a calculator and divide the number of teeth from the ring gear by the number of teeth in the pinion gear. This way you know exactly what is in your car.