Again, the overall first-gear ratio with the TH400 and 4.10:1 rear gear would be 10.168:1. But 10.168 / 4.70 (to determine the equivalent rear-gear ratio) equals 2.16:1, which is not realistic.

How to calculate gear ratios for improved performance Calculating gear ratios requires an understanding of the relationship between two gears: the input gear and the output gear. By adjusting the gear ...

If we have a 4.11 axle ratio, a 30-tooth over a 22-tooth QC ratio being 1.3636, then our drive ratio (DR) is 5.6045. If we then divide the tire circumference of 85 inches by the DR, our final ...