I think the 5.0 or even the 5.7 is nice for the reasons (gear mapping between low and high) mentioned above. Plus if you go to a dual setup later on, you can put a 2.28 in the crawler box and have a nice staggered gear setup. The lefty doesn't have a 2.28 or 2.56 option, just 4, 4.7, 5, and 5.7last question before i finish up some CHEM homework, if i werent going for the doubler or crawler box, just the lefty, which gear ratio would either of you guys recommend? 4.0:1 and then later on if i decide i need a doubler, throw in one with similar stock gearing? or can only the lefty have stock gearing [but even then i dont see it on inchworms site]?