What does rear ratio in a semi means?

Discussion in 'Ask An Owner Operator' started by TRUCKER101ROOKIE, Jan 25, 2023.

  1. TRUCKER101ROOKIE

    TRUCKER101ROOKIE Light Load Member

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    I would be hauling a flatbed with upto 48k cargo. Do you consider that heavy haul or regular. Lower gear ratio or higher ratio is better for that?
     
  2. TRUCKER101ROOKIE

    TRUCKER101ROOKIE Light Load Member

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    Do you think this info is correct


    Truck specs 2019 or above
    1720-1750 torque good for regular cargo haulers upto 48k
    Equipment I will be using - flatbed
    Will be doing otr mostly running flat surfaces



    1720-1750 torque good for regular cargo haulers up-to 48k lbs


    Frieghtliner

    445-465 Hp

    Gear ratio 3.08



    Peterbilt

    2019 579 paccar mx13 455hp 1750 torque 3.10 gear ratio 13 speed transmission

    7.2 mpg @65 mph loaded

    10.2 mpg@65 mph empty

    Equipment~Step deck



    Kenworth





    Volvo

    2.64 rear ratio with 12 speed
     
  3. gokiddogo

    gokiddogo Road Train Member

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    Any of those should be suitable for 80k or less.

    Heavy haul = you need to buy permits for weight
     
  4. rabbiporkchop

    rabbiporkchop Road Train Member

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    4:11 gears for steep mountain grades at 55 mph and 3:55 gears for flat ground at high speed.
     
  5. Long FLD

    Long FLD Road Train Member

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    Maybe back in the old days.
     
  6. ducnut

    ducnut Road Train Member

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    Tons of misinformation in this thread.
     
  7. Siinman

    Siinman Road Train Member

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    Seems to be the norm when it comes to spec'ing a truck these days.
     
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  8. ducnut

    ducnut Road Train Member

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    Yep. Given the wide range of RPM’s different engines want to run in and transmission differences, I’m not wasting my time. Haha.
     
  9. Siinman

    Siinman Road Train Member

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    Truth
     
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  10. D.Tibbitt

    D.Tibbitt Road Train Member

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    Any old fleet truck will work hauling 80k.