Can some please teach me the gear reduction equation??? You know, what you use to find out your final crawl ratio. Also, can someone please tell me the granny low ratio in an SM465? What about an NV4500??? Can someone please tell me the first gear ratio of that tranny? And while we're on the topic of ratios and equations, can someone teach me about all those different equations that have to do with tire size, desired road speed, r&p ratio, etc etc etc.... I've always wanted to memorize all the different equations for figuring out crap having to do with these trucks.... Any I'm missin'??