Gary and dan both have good points on your post. I kinda wish it was still there if nothing else for reference. i hope that you think about reposting it. i remember when I used to race offRoad RC. i would drive myself crazy with diffent pinion and spur combinations trying to get the "perfect balance" of battery life to speed to torque. aside from the names of 3:1 and 4:1 i think that most of the people that visit the forums would agree however you decide to classify or define what type of gearbox you have that info like gearing and tooth count would still be welcome.