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shifting ranges for trucks

Discussion in 'Questions From New Drivers' started by BigpopperRunner, Jan 14, 2020.

  1. Jan 14, 2020 #1
    BigpopperRunner

    BigpopperRunner Light Load Member

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    Jan 10, 2019
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    Hey guys,

    Was just wondering what are the shifting ranges for a 10 and 13 speed for a volvo and peter bilt? I tested in a 10 speed freightliner and up shifting was 10-12 RPM for low gears and 14-15 for higher gears. Down shifting was clutch out of gear and rev to 10-11 RPM and clutch it in gear. I watched a few videos and it seems the volvo's are a lot higher with the RPM around 15 RPM for upshifting and I am assuming peter bilt's run the same between 10-14 RPM? Never drove a 13 speed before.

    Thanks!
     
    BigpopperRunner, Jan 14, 2020
    BigpopperRunner, Jan 14, 2020
    #1
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  3. Jan 14, 2020 #2
    lovesthedrive

    lovesthedrive R.I.P.

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    Some of it isnt so much the transmission. Some of it is the engine itself. Caterpillars are a slower turning engine.
     
    lovesthedrive, Jan 14, 2020
    lovesthedrive, Jan 14, 2020
    #2
    MACK E-6 Thanks this.
  4. Jan 14, 2020 #3
    MACK E-6

    MACK E-6 Moderator Staff Member

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    Detroit 60’s don’t tolerate lugging at all, where a CAT would take shifting a lower speeds better.
     
    MACK E-6, Jan 14, 2020
    MACK E-6, Jan 14, 2020
    #3
    lovesthedrive Thanks this.
  5. Jan 14, 2020 #4
    Brandt

    Brandt Road Train Member

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    I would say shift low range 1,000 RPMs because you don't have to match the gears and you don't need all that power to get rolling. Then when you go to high range shift at 1,600 RPMs. The reason you shift at 1,600 RPMs is because most transmission have a 400 RPM step between grease. So it will go into the next gear at 1,200 RPMs that also right at the most pulling power for most engines.
     
    Brandt, Jan 14, 2020
    Brandt, Jan 14, 2020
    #4
  7. Jan 14, 2020 #5
    Long FLD

    Long FLD Road Train Member

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    It depends on the engine. If it’s a newer Volvo or Paccar engine then lower rpm’s will be your friend. I run my Paccar 1000-1400, figuring in a 200 rpm drop with the split.
     
    Long FLD, Jan 14, 2020
    Long FLD, Jan 14, 2020
    #5
  9. Jan 16, 2020 #5
    feldsforever

    feldsforever Road Train Member

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    Nov 22, 2019
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    This Cascadia to me is difficult. Out side of school. Its the only manual tt I have driven.
    I notice its all about rpms and momentum. The speed dont mean squat. For example. When really heavy. Or when climbing a hill I have to shift early. When I down shift. I have to be going slower than the gear I want. And when I'm empty it shifts it self.
    The rpms come into affect on flat ground when carrying less than 20k. Only time I don't use the clutch. Its a 13 speed. Hope it helps ya
     
    feldsforever, Jan 16, 2020
    feldsforever, Jan 16, 2020
    #5
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