Ahehe... sabi ko na nga bat tuliro pa rin ako nung pinaliwanag ko kanina...

Basic rule:
1. Higher numerical number is lower gear. Raises your rpm at a certain speed. Sample: 1st gear = 4.556; 2nd gear = 2.625

2. Lower numerical number is higher gear. Lowers engine rpm on high gear or top gear. Sample: 4th gear = 1.000; 5th gear = 0.836

You will also have to consider your final gear ratio, either for top speed lower numerical number, vice versa.