Gearing and Crawl Ratio's

[SC74]

I always think of a 18 spd. bicycle when I think about gearing in a truck. That way you've got your 3 main gears (tranny, t-case, axles) plus 6 sub-gears (trans. gears, t-case high/low) on each main gear.

As for tire size, it takes more to turn the bigger meat. Just like on a bicycle, it takes more effort to turn a larger tire (especially off of the start) than it does a smaller one.