3.42 gear ratio

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

  1. johndeere4020

    johndeere4020 Road Train Member

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    Look I don’t mind being wrong and it looks like I am this time, but it’s not something that would concern me. I know a buuuunch of trucks that are technically illegal and no one has ever bothered them.
     
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  3. Dave_in_AZ

    Dave_in_AZ Road Train Member

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    Well I've signed multiple documents saying Casper is legit.

    So I guess I'll keep that way.

    Something inside of me just keeps telling me any other way is the wrong way.

    Guess it's that part of The Bible that says " Even a little yeast, doth leaven the whole thing."
     
  4. Espressolane

    Espressolane Road Train Member

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    It the cats. They have mind control technology.
     
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  5. Misesian

    Misesian Road Train Member

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    Depends how fast you want to run. Best MPG will be between 1250-1375. You can find rpm speed calculators on line to input your variables and it will tell you what rpm a particular combination of specs and speed will give you.
     
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  6. KB3MMX

    KB3MMX Road Train Member

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    Sky falling? No the penalty is real.. Fact.
    Get caught and you will wish you didn't... Who cares if 100 other people got away with it.. All it takes is once.

    Roll the dice with your freedom? Why?
    Mine has MUCH more value to me instead of trying to claim ignorance... Which isn't a defense of they wanna stick it to you.

    .
     
    Last edited: Aug 14, 2018
  7. KB3MMX

    KB3MMX Road Train Member

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    So if you want to lessen gear rowing getting up to speed, why are you shortening the mph span between them with wanting 3.55?

    A 600 should have plenty of power on 3.42s on highways .... Are you operating under 60 mph most of the time or something? If so, you'd probably want a 3.70 , 3.90 or 4.10 rear like a dump truck.
     
    Last edited: Aug 14, 2018
  8. Tug Toy

    Tug Toy Road Train Member

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    No one has ever asked me if the emissions system is intact on my semi truck. Nor have I been asked to sign something saying so. Even got an overweight ticket at the Raindow scale in Southern California. Still Not one question about the emissions status of my truck.

    I’ve been running around in semi trucks since 1992.
     
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  9. Dadetrucking305

    Dadetrucking305 Heavy Load Member

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    Will the rpms be too high on a 3.70 at 65mph?
     
  10. KB3MMX

    KB3MMX Road Train Member

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    Yeah it'll be high rpm but pull like a mule you'll probably never have to downshift.
    Fuel economy? Fuhgetaboutit...lol

    I personally wouldn't want anything near that in a road tractor but a dump truck or heavy haul.. yes

    My new truck has 3.08s with a 18spd. 1300rpm at 68mph... About 1200@63.
    Peak tq @ 1150rpm.

    My 2016 Volvo uses 2.64s cause the OD gearing isn't as deep as the 18spd. That gives 1200@68mph. Peak tq @ 1050rpm.
     
  11. AModelCat

    AModelCat Road Train Member

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    I went from 5.29's to 3.73's. Might be able to break the 5 mpg mark empty :p
     
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