I am thinking about picking up some 65 or 75 turn motor's for my clod. Will these be low enough, or should I end up with some 9t pinion's. I have 55t motor's right now and they crawl pretty well, I am getting really used to having the extra tire speed, but would like a little more slow speed control. So the Question is, where do I find some 65 or 75t motors?