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Gearing questions

Discussion in '2.5 Gen TRD Pro (2014-2021)' started by gunrunnersactual, Jun 25, 2019.

  1. Jun 25, 2019 at 5:36 AM
    #1
    gunrunnersactual

    gunrunnersactual [OP] New Member

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    I've looked around the forums and haven't seen an answer to this, maybe I just missed it though, but has anyone changed their gearing on a stock Pro? I understand changing gearing when you add a lift/tires or constantly carry tons of extra weight, but I'm more curious about stock or fairly close to stock trucks changing their gears to 4.88's and what sort of differences they've seen in mpg, acceleration, towing etc?
     
  2. Jun 25, 2019 at 5:40 AM
    #2
    Rex Kramer

    Rex Kramer Vinyl Spinner

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  3. Jun 25, 2019 at 5:47 AM
    #3
    gunrunnersactual

    gunrunnersactual [OP] New Member

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    They are discussing trucks with 35" tires in that thread. I had previously looked at it, but it doesn't really answer my question as I'm looking for details on changing gears on a stock truck
     
  4. Jun 25, 2019 at 5:49 AM
    #4
    Hbjeff

    Hbjeff New Member

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    I think the type of driving you do makes a huge difference.

    I do 95% city driving. I imagine that 4.88s would feel great with stock tires as effortless acceleration. Freeway though it is excessive. Just depends on how you favor your balance
     
  5. Jun 25, 2019 at 5:57 AM
    #5
    gunrunnersactual

    gunrunnersactual [OP] New Member

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    What would it do to mpg?
     
  6. Jun 25, 2019 at 5:58 AM
    #6
    Hbjeff

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    Next time on the freeway cruise in 5th and compare the mpg estimate on the dash to 6th

    With conservative driving i dont see the city mpg changing that much. Same object moving the same speed
     
  7. Jun 25, 2019 at 5:59 AM
    #7
    Rex Kramer

    Rex Kramer Vinyl Spinner

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    My truck is basically stock, so I changed my gear ratio by installing slightly smaller tires. Driving a steady 65 MPH in S-4, my tachometer reads 3150 RPMs. 4.30 towing package ring & pinion spinning 31.46" 285/60-18 tires. That works out mathematically to something like a 4.60 gear ratio, acceleration is improved and I use 5th and 6th gear overdrives for fuel economy.
     
    Last edited: Jun 25, 2019
  8. Jun 25, 2019 at 6:00 AM
    #8
    cnoyes72

    cnoyes72 New Member

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    It's been my understanding that taller gears mean less mpg (probably why the big 3 put 3.42 gearing and the like for even their towing packages, to eek out as much mpg as possible).
     
  9. Jun 25, 2019 at 6:36 AM
    #9
    Hbjeff

    Hbjeff New Member

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    These mpg tests are usually done in unrealistic conditions such as cruise control slow speeds. Stoplight to stoplight driving is far different than steady throttle flat freeway
     
  10. Jun 25, 2019 at 6:37 AM
    #10
    gunrunnersactual

    gunrunnersactual [OP] New Member

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    So the mpg improvements that people report when swapping gearing is just simply because they are compensating for the extra size in tires and lift and gear they haul?
     
  11. Jun 25, 2019 at 6:40 AM
    #11
    Hbjeff

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    Bigger tires turn slower. They take longer to spin all the way around than a smaller circle. Thats why rpms’s go down with bigger tires at any given speed. You change gears to get the rpm’s back to where they were stock at that speed
     

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