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Chevy Silverado
Chevy Suburban

How will changing the axles gears affect your gas mileage I currently have 373s in a 96 Yukon 4x4 and was think about going to a 308?

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Wiki User
February 02, 2009 5:54AM

it depends on your tire size. just multiply your tire size (inches) by .13 and that will give you the gears for back to factory settings. or by .14 to give you more torque. or if you want it for gas, then multiply it by .12 and whatever gears are closest to that number will give you the best gear ratio. on my silverado, i got 35' tires and im running 5.13 gears for more torque. you can deffinitely feel the difference on take off. i can spin my tires with positraction on my stock motor.