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Gearing and pulling, 3.08 gears with Mdrive in a Mack

Discussion in 'Mack Forum' started by Mattmanstroked, Feb 10, 2021.

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  1. Feb 10, 2021 #1
    Mattmanstroked

    Mattmanstroked Light Load Member

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    Nov 24, 2019
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    Trying to get an idea of how some 3.08 gears are going to pull with a Mdrive and a 445hp in a Mack truck.

    This will be a road truck grossing close to 80k most times. Max speed of 70mph. Pulling tank trailers most of the time.

    Current truck has Cummins 450hp with 13 speed and 3.36 gears. It doesn't pull very hard.
     
    Mattmanstroked, Feb 10, 2021
    Mattmanstroked, Feb 10, 2021
    #1
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  3. Feb 10, 2021 #2
    Concorde

    Concorde Road Train Member

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    Your problem is low HP..450hp and likely low torque.

    For pulling heavy loads constantly I wouldn’t have anything less than 500hp.

    You have what I call a “Flatlander truck” :)
     
    Concorde, Feb 10, 2021
    Concorde, Feb 10, 2021
    #2
    TripleSix and Bean Jr. Thank this.
  4. Feb 10, 2021 #3
    Mattmanstroked

    Mattmanstroked Light Load Member

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    Man running a Mack in the logging woods has a 505hp Mdrive and 3.56 gears. Says he is running in Eco mode and it pulls plenty hard. They usually gross 85k or little more depending how close to the mill they are.

    Have driven a Mack with 445hp and 13 speed not sure on rear gears, they were low cause 70mph is like 1700rpm. It pulled very well.

    I just don't want to get another truck and it not pull better than the one I currently have.
     
    Mattmanstroked, Feb 10, 2021
    Mattmanstroked, Feb 10, 2021
    #3
  5. Feb 10, 2021 #4
    Sharky88

    Sharky88 Heavy Load Member

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    I have a Volvo with 2.64 gears 500 up 2050 tq it pulls very well. Mack and Volvo engines are the same just rebranded
     
    Sharky88, Feb 10, 2021
    Sharky88, Feb 10, 2021
    #4
    Mattmanstroked Thanks this.
  7. Feb 11, 2021 #5
    Truckwork2461

    Truckwork2461 Bobtail Member

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    Feb 10, 2021
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    Have you considered a HP upgrade? Shoot me your VIN and I can see what’s available. Some trucks it’s a matter of programming while others require part replacements.
     
    Truckwork2461, Feb 11, 2021
    Truckwork2461, Feb 11, 2021
    #5
    gekko1323 Thanks this.
  8. Feb 11, 2021 #6
    TripleSix

    TripleSix God of Roads

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    3.36:1 gears will pull worlds better than 3.08:1 gears ever could. For a freighthauler sticking with 80k GVW, ideal would be 500 hp, and 3.55:1 gears out back
     
    TripleSix, Feb 11, 2021
    TripleSix, Feb 11, 2021
    #6
  9. Jan 18, 2022 #7
    brysol01

    brysol01 Medium Load Member

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    Nov 2, 2009
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    i have a 2020 Mack MP-8 445C 12 spd M drive with 3:11 rears @1400 rpm
    i'm doing 68 just over 7 MPG, with summer fuel
     
    brysol01, Jan 18, 2022
    brysol01, Jan 18, 2022
    #7
  10. Jan 18, 2022 #8
    BobO1176

    BobO1176 Light Load Member

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    Oct 29, 2021
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    3.58 and 1350rpm at 62mph on mine. Perfect for my speeds.
     
    BobO1176, Jan 18, 2022
    BobO1176, Jan 18, 2022
    #8
    brysol01 Thanks this.
  11. Jan 18, 2022 #9
    brysol01

    brysol01 Medium Load Member

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    i am gonna drop it down , just over the line at 13350 is 65, and see if my fuel mileage improves some
     
    brysol01, Jan 18, 2022
    brysol01, Jan 18, 2022
    #9
  12. Jan 31, 2022 #10
    gekko1323

    gekko1323 Road Train Member

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    Henderson, NV
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    Can you get the specs on any truck with the vin?
     
    gekko1323, Jan 31, 2022
    gekko1323, Jan 31, 2022
    #10
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