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  1. #1

    Default Gearing question 2010 silverado 4.8L

    Hey yall, me again

    Just curious i got a 2.5" leveling kit and 33" tires, and now well needless to say my mileage is JUNK . Just curious im looking at re-gearing the rear end just curious what ratio would be best to go with. I mostly drive city but also a couple times a year do long highway drives and to get to the next town its 80km/h roads. Just curious what yall think.

    Thanks again

  2. #2

    Default

    Plot your original tire size and gear ratio on this chart to see where you fell on it before any modifications. Once done find the similar box for your new tire size. That'll give you a rough SWAG on what gears to use to maintain stock performance with your new tires. You can, of course, adjust to shorter or longer gears from that point to taste ... to sacrifice performance for MPG or vice versa.

    Click image for larger version. 

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    NOTES:
    Re-gearing won't recover MPG lost to weight and aerodynamic changes that you've made.
    • Those 33's weigh more than your OEM tires did, so you lost MPG (and towing capacity and hauling capacity) because of that weight. If your spare isn't a 33" tire then it can't be used with your other 4 tires, so you can remove it to shed some extraneous weight and recover a little MPG that you lose.
    • By raising your truck you have also adjusted aerodynamic characteristics that hurt your fuel economy. That goofy bumper valence that comes stock under the front fascia adds about 1 MPG to OEM trucks. It's likely -not- doing that for you, anymore. Most people who lift also remove the valence since the truck tends to look tougher without it ... and it's not doing its original job (well? at all? *shrug*) after lifiting. It's designed to be fairly easy to remove/replace so you might experiment with it to see if it makes any difference for you. Mine's long gone...

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