I put together a very simple spreadsheet for those of us that like to use math but do not like to do math. This is for use when going from one gearing in the 393 motor to another. If you have figured out the counts you need for high strength, high speed, or turbo and want to switch to a different gearing, this spreadsheet will make the calculation for you while showing you how it got the calculation.
It is no big breakthrough, but some might find it helpful,
https://copy.com/xUd8Es0l7w0LMwaP
I stored it on copy.com. If you would like a free account with a lot of online storage, click here to sign up: