13 vs 18 speed.

Discussion in 'Trucks [ Eighteen Wheelers ]' started by belltransit, May 3, 2011.

  1. belltransit

    belltransit Light Load Member

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    correct me if im wrong here. a 13 speed is used on 1650 ft/lbs torque motors and an 18 is used behind 1850 and 2050 ft/lbs torque motors.
     
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  3. lostNfound

    lostNfound Road Train Member

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  4. RoyBean

    RoyBean Bobtail Member

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    sedalia,ky
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    The big diffrence is that you can split the bottom five gears. Roy
     
  5. belltransit

    belltransit Light Load Member

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    Jun 28, 2010
    oak grove, mo
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    cool. i was always wondering about the torque limit on the 13 and 18s. im goin to be buyin a newer truck and ive been seeing both 13s and 18s in the trucks.
     
  6. Gambi80

    Gambi80 Medium Load Member

    The 18sp isn't really necessary...I've got one and rarely, if ever, split the low gears. Bout the only time I do is in reverse to go that little bit faster.
     
  7. ProduceHauler

    ProduceHauler Light Load Member

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    California
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    A lot depends on rear axle gear ratio - I got 3.36 and use them gears all the time
     
  8. Les2

    Les2 Road Train Member

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    And weight you pull around.

    I just found out there is actually no difference between the 1600 ft lbs and 1800 ft lbs 13 spd transmissions. The gears and bearing are the same.
     
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  9. 07-379Pete

    07-379Pete Crusty Commando-Pete

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    I have been trying to tell people that for some time now......note the word trying.
     
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  10. Licensed to kill

    Licensed to kill Heavy Load Member

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    With the light loads that most seem to pull, that's true but not all trucks are running around at <90,000 lbs.
     
  11. Jfaulk99

    Jfaulk99 Road Train Member

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    Even with more weight most of the time splitting the lower gears is overkill. If I can pull 120k with 3.36 gears 24.5's and a 13 with no problems I can't imagine a guy with small tires or lower gears needs the 18.
     
    Oxbow, Yup and 07-379Pete Thank this.
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