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3.42 gear ratio

Discussion in 'Flatbed Trucking Forum' started by Dadetrucking305, Aug 11, 2018.

Page 1 of 13
  1. Aug 11, 2018 #1
    Dadetrucking305

    Dadetrucking305 Heavy Load Member

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    Wondering If a 3.42 gear ratio is good enough for flatbed at 80k? Motor would be a DD15 505 hp and 13 speed.
     
    Dadetrucking305, Aug 11, 2018
    Dadetrucking305, Aug 11, 2018
    #1
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  3. Aug 11, 2018 #2
    uncleal13

    uncleal13 Road Train Member

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    What year is the truck and what size tires?
    The thirteen speed gives you some flexibility.
     
    uncleal13, Aug 11, 2018
    uncleal13, Aug 11, 2018
    #2
  4. Aug 11, 2018 #3
    Dadetrucking305

    Dadetrucking305 Heavy Load Member

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    I’m looking at 2015 Cascadias.What size tires would they need to be? Having trouble finding one with 3.55 gear ratio.
     
    Dadetrucking305, Aug 11, 2018
    Dadetrucking305, Aug 11, 2018
    #3
  5. Aug 12, 2018 #4
    Dadetrucking305

    Dadetrucking305 Heavy Load Member

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    Most of the ones I’m seeing are 22.5
     
    Dadetrucking305, Aug 12, 2018
    Dadetrucking305, Aug 12, 2018
    #4
  7. Aug 12, 2018 #5
    Espressolane

    Espressolane Road Train Member

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    That is exactly what my last truck was. Had no problems with that set up. Pulled fine, reasonably good fuel economy.
     
    Espressolane, Aug 12, 2018
    Espressolane, Aug 12, 2018
    #5
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  8. Aug 12, 2018 #6
    Dave_in_AZ

    Dave_in_AZ Road Train Member

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    Mines a 3.58.

    3.58 or 3.55 is just different manufacturers.

    Look for an old Gordon truck. The light blue ones.

    20180616_091057.jpg
     
    Last edited: Aug 12, 2018
    Dave_in_AZ, Aug 12, 2018
    Dave_in_AZ, Aug 12, 2018
    #6
    Rollr4872, cke and Dadetrucking305 Thank this.
  9. Aug 12, 2018 #7
    KB3MMX

    KB3MMX Road Train Member

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    RPM vs MPH.

    So many variables, the rear end is only part of the picture.

    FYI ... My current truck is 2.64 with overdrive and i run gross frequently... I'm sure you'll be fine.
     
    KB3MMX, Aug 12, 2018
    KB3MMX, Aug 12, 2018
    #7
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  10. Aug 12, 2018 #8
    Dave_in_AZ

    Dave_in_AZ Road Train Member

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    Depends where you plan on running too.

    If you're gonna be in the Midwest and more on the flat, the 3.42 or 3.36 or 3.23 is a good choice.
     
    Dave_in_AZ, Aug 12, 2018
    Dave_in_AZ, Aug 12, 2018
    #8
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  11. Aug 12, 2018 #9
    TripleSix

    TripleSix God of Roads

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    The drivetrain should be good. A mid roof would be better. What wheelbase are you looking at? I wouldn’t go really short on the web. BTW, 244wb looks good on an aero hood.
     
    TripleSix, Aug 12, 2018
    TripleSix, Aug 12, 2018
    #9
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  12. Aug 12, 2018 #10
    Dadetrucking305

    Dadetrucking305 Heavy Load Member

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    226-230.
     
    Dadetrucking305, Aug 12, 2018
    Dadetrucking305, Aug 12, 2018
    #10
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