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gear ratio and axle specs

Discussion in 'Trucks [ Eighteen Wheelers ]' started by fredrd, Oct 23, 2015.

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  1. Oct 23, 2015 #1
    fredrd

    fredrd Light Load Member

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    i am building a single axle refrigerated van, dealer has me in a gear ratio of 5.63 and axle config of 10,000 front 23,000 rear. meritor wide beam truck weight distribution without the reefer box is 6900/4200. truck i am replacing is 12,000 front and 21,000 rear.(33,000) also changed from sfa to sba. does this sound right? should i have the lower front axle for the stronger rear? truck grade ability at this gear ratio is 48.04%/2.42%@55mph
     
    Last edited: Oct 23, 2015
    fredrd, Oct 23, 2015
    fredrd, Oct 23, 2015
    #1
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  3. Oct 23, 2015 #2
    KB3MMX

    KB3MMX Road Train Member

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    Dear lord is it a 150hp motor????
     
    KB3MMX, Oct 23, 2015
    KB3MMX, Oct 23, 2015
    #2
  4. Oct 23, 2015 #3
    AModelCat

    AModelCat Road Train Member

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    I wouldn't think having a heavier rear axle will compensate for having a lighter front axle. Not sure what the regs are in the US but a single drive axle is only legal to I believe 9100kg/20,000lbs in western Canada.
     
    AModelCat, Oct 23, 2015
    AModelCat, Oct 23, 2015
    #3
  5. Oct 23, 2015 #4
    fredrd

    fredrd Light Load Member

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    325hp Cummins isb
    I know my 12k front 21 rear had been ok for a 24ft box.. I just don't know if a 10k/ 23 k config is that much of a difference to worry about
     
    fredrd, Oct 23, 2015
    fredrd, Oct 23, 2015
    #4
  7. Oct 23, 2015 #5
    fredrd

    fredrd Light Load Member

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    Why do you say 150 because of the gears? It's 325hp for a little box truck. I have 3.90 gears on a 350hp and it's a dog down low
     
    Last edited: Oct 23, 2015
    fredrd, Oct 23, 2015
    fredrd, Oct 23, 2015
    #5
  8. Oct 23, 2015 #6
    Ruthless

    Ruthless Road Train Member

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    I'd think as long as you push that rear axle forward a bit to make sure you aren't ending up heavy on the steer you'd be fine.

    Would it hurt to put a 12k steer and a 23k rear? I'd rather overbuild a bit than feel like I'm gonna be whooping on something...I sure there's a difference on the price tag.
     
    Ruthless, Oct 23, 2015
    Ruthless, Oct 23, 2015
    #6
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  9. Oct 24, 2015 #7
    drdesl

    drdesl Light Load Member

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    Good Lord, upgrade to the ISC 8.3. You will not regret it over the B 6.7
     
    drdesl, Oct 24, 2015
    drdesl, Oct 24, 2015
    #7
  10. Oct 24, 2015 #8
    fredrd

    fredrd Light Load Member

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    Do you really need more power in a little straight truck?
     
    fredrd, Oct 24, 2015
    fredrd, Oct 24, 2015
    #8
  11. Oct 24, 2015 #9
    fredrd

    fredrd Light Load Member

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    Problem is over 33000 gvwr federal excise tax is like $8k extra
     
    fredrd, Oct 24, 2015
    fredrd, Oct 24, 2015
    #9
  12. Oct 24, 2015 #10
    Ruthless

    Ruthless Road Train Member

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    Reg it lower?
    Id rather have more truck than I need than save $8k and break something.

    I have a 10 wheeler @ 475horse. Rarely over 33k gross & it's gotta be at least 22 tare. It's real laggy compared to my road tractor.

    If you are buying it, and you are driving it: I don't think there's such thing as too much power.
     
    Ruthless, Oct 24, 2015
    Ruthless, Oct 24, 2015
    #10
    drdesl Thanks this.
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