Proper Gear Ratio

Discussion in '2004 - 2008 Ford F150 Truck Forum' started by Brettp, Jul 3, 2018.

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  1. Brettp

    My 2005 f150 has a small lift and 33’s. It gets pretty bad mpg and terrible acceleration. What would be the right gear ratio for my truck to improve acceleration? If you have any suggestions for what brand I’d appreciate it!
     
    Brettp, Jul 3, 2018
    #1
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  2. FTZ HAIC Staff Member Oregon Chapter Founding Member

    What ratio is it at now? Gearing will help with the acceleration, but a lift will almost always hurt mileage.
     
    FTZ HAIC, Jul 4, 2018
    #2

  3. Brettp

    I believe it’s ratio is 3.73. Would it be a waste of money to change it?
     
    Brettp, Jul 4, 2018
    #3

  4. dustybumpers Article Contributor Founding Member

    Anything less than 3.73, and it will be a slug with big tires on it.
     
    dustybumpers, Jul 4, 2018
    #4

  5. FTZ HAIC Staff Member Oregon Chapter Founding Member

    Yeah, many trucks with stock 31" come with 3.55 or 3.73, so the 33" would be light a 3.55 combo (close). 3.73 or if you want a tad better acceleration 4.11.
     
    FTZ HAIC, Jul 6, 2018
    #5

  6. dustybumpers Article Contributor Founding Member

    Yup
    Because when you put in the taller tire, the 3.73 will drop to say a 3,55 at a 33" tire, 3.10 at a 35" tire, etc.
    I found this out the hard way.
     
    dustybumpers, Jul 6, 2018
    #6
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