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Originally Posted by mayito
I have a 2003 5.3 silverado with 3.42 gears. I want to put in either 3.73 or 4.10 gears. Does anyone have experience as to which one is better? Is their a big difference in gas mileage between both of them. thanks
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Rule of the thumb the lower the rear end the lower the gas mileage.
Why do you want to change to a lower rear end?
Also tire size plays a big part in to.
Here is a link that may help.
http://www.differentials.com/install.html
MT