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3:36 vs 3:91

Discussion in 'Ask An Owner Operator' started by Randhawa.56, Jan 5, 2022.

  1. Jan 5, 2022 #1
    Randhawa.56

    Randhawa.56 Bobtail Member

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    Hello truckers, I got a cascadia 2016
    Dd16 500hp 13 spd 22.5 tires And 3:91 gear ratio. The mpg im getting is 4.9 on 69-72mph
    I wanna know if i will chage gear ratio to 3:36 how much difference it will make.
    Thank you
     
    Randhawa.56, Jan 5, 2022
    Randhawa.56, Jan 5, 2022
    #1
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  3. Jan 5, 2022 #2
    Magoo1968

    Magoo1968 Road Train Member

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    It should improve dramatically 3.91 is a heavy haul gear. Dd16 is a low rpm motor
     
    Magoo1968, Jan 5, 2022
    Magoo1968, Jan 5, 2022
    #2
    Brettj3876, Bean Jr. and Randhawa.56 Thank this.
  4. Jan 5, 2022 #3
    Pamela1990

    Pamela1990 Road Train Member

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    How much do you weigh when loaded?
    Mountainous terrain, or flat lands?
     
    Pamela1990, Jan 5, 2022
    Pamela1990, Jan 5, 2022
    #3
  5. Jan 5, 2022 #4
    Randhawa.56

    Randhawa.56 Bobtail Member

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    40000lbs on flats
     
    Randhawa.56, Jan 5, 2022
    Randhawa.56, Jan 5, 2022
    #4
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  7. Jan 5, 2022 #5
    Pamela1990

    Pamela1990 Road Train Member

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    Definitely use some taller gears then.
     
    Pamela1990, Jan 5, 2022
    Pamela1990, Jan 5, 2022
    #5
    Bean Jr. Thanks this.
  8. Jan 5, 2022 #6
    ProfessionalNoticer

    ProfessionalNoticer Road Train Member

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    You may be able to switch to taller tires or wheels instead of changing gears depending on how far gone you're current tires are.
     
    ProfessionalNoticer, Jan 5, 2022
    ProfessionalNoticer, Jan 5, 2022
    #6
    Brettj3876 and Pamela1990 Thank this.
  9. Jan 5, 2022 #7
    AModelCat

    AModelCat Road Train Member

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    Cost vs reward.

    How long will it take to break even on the cost of re-gearing?
     
    AModelCat, Jan 5, 2022
    AModelCat, Jan 5, 2022
    #7
    Last Call, Brettj3876 and Pamela1990 Thank this.
  10. Jan 6, 2022 #8
    dirthaller

    dirthaller Heavy Load Member

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    Interesting that you chose 3.36 to compare to because 3.36 is exactly 1/2 gear above 3.91. You’ll be running the exact same speed at the exact same rpm only now your transmission will be in 12th gear instead of 13th. So basically you’ll be adding another overdrive gear. If you want to burn clutches up, you can go to 2.85 gears and be exactly a whole gear above 3.91 (basically same speed/rpm in 11th gear vs 13th)
     
    dirthaller, Jan 6, 2022
    dirthaller, Jan 6, 2022
    #8
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  11. Jan 6, 2022 #9
    abyliks

    abyliks Road Train Member

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    If you are on low pro rubber I would try and go to an 11r or 12r first.

    taller gears are great until you go to take off loaded, even my 3.55s are a smidge to tall, 3.91 are about a perfect highway gears if you are running 11r24.5
     
    abyliks, Jan 6, 2022
    abyliks, Jan 6, 2022
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    ProfessionalNoticer Thanks this.
  12. Jan 7, 2022 #10
    Brettj3876

    Brettj3876 Road Train Member

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    Talk about overkill for flat land and legal weights Lol
     
    Brettj3876, Jan 7, 2022
    Brettj3876, Jan 7, 2022
    #10
    Magoo1968 Thanks this.
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