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Torque uprate vs transmission

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Xzachtly, Dec 2, 2018.

  1. Dec 2, 2018 #1
    Xzachtly

    Xzachtly Bobtail Member

    21
    24
    Feb 10, 2018
    Illinois
    0
    I’ve been doing some research and can’t seem to find any conclusive answers to my question. I have a Kenworth with a Cummins n14 plus running into a Rockwell 9 speed (RMX 9 155B). Truck sits on tall 24.5s and has a 3.91 rear ratio. Right now it’s tuned to 525hp 1590 ft/lbs and just doesn’t hold in the hills. Is there any likleyhood of the 9 speed holding up with a 1850ft/lb tune? Obviously can’t be stomping on it at the pedal but I don’t usually drive heavy anyway.
     
    Xzachtly, Dec 2, 2018
    Xzachtly, Dec 2, 2018
    #1
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  3. Dec 2, 2018 #2
    DL550CAT

    DL550CAT Road Train Member

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    Waynesburg, Pa
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    My last truck had an 1850 rated trans and well over 2000 lbs of tq. It was not uncommon to gross over a 100,000. I run it for years that way with out issue.
    I never put it to the floor on the low side of the trans when I was loaded.
     
    DL550CAT, Dec 2, 2018
    DL550CAT, Dec 2, 2018
    #2
  4. Dec 2, 2018 #3
    tnevin225

    tnevin225 Road Train Member

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    Have you thought about doing a 13 speed conversion on it also, if it's possible on that model. would help with holding the hills better.
     
    tnevin225, Dec 2, 2018
    tnevin225, Dec 2, 2018
    #3
  5. Dec 2, 2018 #4
    Bakerman

    Bakerman Road Train Member

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    Jan 27, 2013
    Phoenix, AZ
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    I was told there is no difference internally between the 1850 & 2050 tq trans, the extra expense is for the warranty.

    Check you clutch size, as that may be a limiting factor.
     
    Bakerman, Dec 2, 2018
    Bakerman, Dec 2, 2018
    #4
    062 Thanks this.
  7. Dec 2, 2018 #5
    Dirty Britches

    Dirty Britches Light Load Member

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    Dec 1, 2018
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    It will hold up fine. Just don’t snatch gears.
     
    Dirty Britches, Dec 2, 2018
    Dirty Britches, Dec 2, 2018
    #5
  8. Dec 2, 2018 #6
    Xzachtly

    Xzachtly Bobtail Member

    21
    24
    Feb 10, 2018
    Illinois
    0
    I had my local shop check into converting it...they said it wasn’t possible on this model. Eventually I want to put a fuller 13 or 18 in it, it’s not in the budget right now though.
     
    Xzachtly, Dec 2, 2018
    Xzachtly, Dec 2, 2018
    #6
  9. Dec 2, 2018 #7
    T800H

    T800H Medium Load Member

    608
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    Apr 2, 2010
    The Keys
    0
    It will hold up mine is rated at 1650 and my engine is close or over 800 hp been like that since 2010 not a single problem.
     
    T800H, Dec 2, 2018
    T800H, Dec 2, 2018
    #7
  10. Dec 4, 2018 #8
    snowman_w900

    snowman_w900 Road Train Member

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    Nov 25, 2010
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    For the most part that's true, but there is a slight difference in gear hardening on the gear sets between a RTLO 16xxx versus RTLO 18xxx versus RTLO 20xxx transmissions. That's about it really. Bearings and internals are all basically the same.
     
    snowman_w900, Dec 4, 2018
    snowman_w900, Dec 4, 2018
    #8
    SAR and Bakerman Thank this.
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