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Tranny rears ratio

Discussion in 'Experienced Truckers' Advice' started by dawg1966, Oct 7, 2020.

  1. Oct 7, 2020 #1
    dawg1966

    dawg1966 Bobtail Member

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    Oct 7, 2020
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    thinkin about buyin a freightliner witj a dd15 and 13 speed trans what will be the best ratio gears for pullin
     
    dawg1966, Oct 7, 2020
    dawg1966, Oct 7, 2020
    #1
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  3. Oct 7, 2020 #2
    kemosabi49

    kemosabi49 Trucker Forum STAFF Staff Member

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    Too many variables to answer. Where will you run? Mountains? Flatlands? How heavy?
     
    kemosabi49, Oct 7, 2020
    kemosabi49, Oct 7, 2020
    #2
    God prefers Diesels, alds and I glide 47 Thank this.
  4. Oct 7, 2020 #3
    I glide 47

    I glide 47 Road Train Member

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    Need to know final drive of tranny 13 direct. ,13 single over. ,13. ,double over. Also tires size and what kind of weight hauled,
     
    I glide 47, Oct 7, 2020
    I glide 47, Oct 7, 2020
    #3
  6. Oct 7, 2020 #5
    dawg1966

    dawg1966 Bobtail Member

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    Oct 7, 2020
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    Runnin south east haulin 80k + gross weight
     
    dawg1966, Oct 7, 2020
    dawg1966, Oct 7, 2020
    #5
  8. Oct 7, 2020 #5
    dawg1966

    dawg1966 Bobtail Member

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    Oct 7, 2020
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    Think it single over tru k has 3.23 gears but wonderimg how it will pull up to 88k #

    22.5 tires
     
    dawg1966, Oct 7, 2020
    dawg1966, Oct 7, 2020
    #5
  9. Oct 8, 2020 #6
    Brettj3876

    Brettj3876 Road Train Member

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    A RTLO will have a .86 and .73 od. Yes it has 2 od but when ppl talk about a double od most of the time they're referring to the old .62 final which actually has 3 od's

    Most of the time it's .86 .73 few oddballs like RTLO14613B that has .85

    Ratio
     
    Last edited: Oct 8, 2020
    Brettj3876, Oct 8, 2020
    Brettj3876, Oct 8, 2020
    #6
    I glide 47 and God prefers Diesels Thank this.
  10. Oct 8, 2020 #7
    TripleSix

    TripleSix God of Roads

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    Copied in Hell
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    515 to 550HP with an 18913A, 18918A, or 20918A (transmission info should be in the driver's side door jam) and 3.55s to 3.70 gears.
     
    TripleSix, Oct 8, 2020
    TripleSix, Oct 8, 2020
    #7
    God prefers Diesels Thanks this.
  11. Oct 9, 2020 #8
    I glide 47

    I glide 47 Road Train Member

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    Very interesting
     
    I glide 47, Oct 9, 2020
    I glide 47, Oct 9, 2020
    #8
  12. Oct 10, 2020 #9
    Dino soar

    Dino soar Road Train Member

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    Now I'm not looking at the ratio chart but I think it works like this:

    12th gear would be one to one and 13th gear would be two overdrive splits.
     
    Dino soar, Oct 10, 2020
    Dino soar, Oct 10, 2020
    #9
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