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Gears will help with performance (off the line) towing, and mpg. For example 3.23 gears with 32" tires will give better mpg but less performance. 4.10 gears with 32" tires will give a little less mpg but get you off the line quicker. What there doing is allowing you to run at a higher rpm at a certain speed. For example 2000rpm at 60 or 2250 rpm at 60. I'm not to good at explaining these kinds of things but hopefully this will get you startd and someone else can chirp in.:great:
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