Originally Posted by
ThePanda
What was being talked about though was going with a larger pinion and spur or smaller by increasing or decreasing the same # of teeth. Like going from a 35p 85s then going 40p 90s by adding 5 to each. This is just an example though. They both give different ratios. The only way to do this is by having the pinion and spur the same number of teeth.
I know this. That is why my post started with the word "Yep". Merely pointing out a bit of math inherent in the problem.