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Transmission Ratio Differences - A B C types

Discussion in 'Trucks [ Eighteen Wheelers ]' started by WRT Boss Lady, Oct 25, 2016.

  1. Oct 25, 2016 #1
    WRT Boss Lady

    WRT Boss Lady Bobtail Member

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    Oct 25, 2016
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    Can someone please tell me what these different Ratio types refer to?

    My shop is changing a transmission and we don't have the exact same one to replace it with. I found all the specs I need as to how to read the model numbers ... manufacturer, direct/overdrive, # of forward gears, nominal torque. All the eaton and meritor transmissions model numbers (that I've looked at) have this letter designation at the end for "Ratio" of A, B, C. What does this refer to specifically so I can determine how this will impact my choice to install one transmission or another.
     
    WRT Boss Lady, Oct 25, 2016
    WRT Boss Lady, Oct 25, 2016
    #1
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  3. Oct 25, 2016 #2
    Ruthless

    Ruthless Road Train Member

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    What model are you taking out?
     
    Ruthless, Oct 25, 2016
    Ruthless, Oct 25, 2016
    #2
  4. Oct 25, 2016 #3
    Ruthless

    Ruthless Road Train Member

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    A b c can vary with model: i.e. Rtlo16713A has two overdrive gears: while rtlo16718B is the 18 with two overdrive gears.

    What did you have in there, what do you want to put in there?
     
    Ruthless, Oct 25, 2016
    Ruthless, Oct 25, 2016
    #3
    snowman_w900 Thanks this.
  5. Oct 25, 2016 #4
    snowman_w900

    snowman_w900 Road Train Member

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    Usually the ending letter refers to what final output ratio you have. C being higher than A. Depending on the model.
     
    snowman_w900, Oct 25, 2016
    snowman_w900, Oct 25, 2016
    #4
    WRT Boss Lady Thanks this.
  7. Oct 25, 2016 #5
    BoxCarKidd

    BoxCarKidd Road Train Member

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    Google Eaton fuller roadranger transmission ratios, or something like that. They have it all listed.
     
    BoxCarKidd, Oct 25, 2016
    BoxCarKidd, Oct 25, 2016
    #5
    Oxbow and wore out Thank this.
  8. Oct 26, 2016 #6
    wore out

    wore out Numbered Classic

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    I would go off the ratio chart and compare what it came with to what you have in stock. It will also have lengths and weights. Just do a Eaton fuller ratio chart
     
    wore out, Oct 26, 2016
    wore out, Oct 26, 2016
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    Oxbow Thanks this.
  9. Oct 26, 2016 #7
    wore out

    wore out Numbered Classic

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    Sorry I reposted boxcar's info. I'm battin a hundred today
     
    wore out, Oct 26, 2016
    wore out, Oct 26, 2016
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    Oxbow Thanks this.
  10. Dec 6, 2016 #8
    WRT Boss Lady

    WRT Boss Lady Bobtail Member

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    Thank you for responding, we got it done. ... Snowman_w900 - you are right on!

     
    WRT Boss Lady, Dec 6, 2016
    WRT Boss Lady, Dec 6, 2016
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    snowman_w900 Thanks this.
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