2007 Volvo VT830 D16 535HP, changing rear axles ratio from 3:55 to 3:36

Discussion in 'Volvo Forum' started by sbreeden, Nov 17, 2019.

  1. sbreeden

    sbreeden Bobtail Member

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    Since I only pull less that 30k dry van, cruising at 65mph at 1475RPM w/18 speed trans, is just blowing my profit out the stacks.

    Volvo data sheet states with a 3:36.1 rears with .74 in 18th gear, cruising should be at 1350, to me that's ideal

    Have anyone did this swap and how did it turn out?
     
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  2. 062

    062 Road Train Member

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    If you’re running lo pro rubber,switching to tall rubber will get you pretty close and a lot cheaper.
     
  3. tnevin225

    tnevin225 Road Train Member

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    If your going through the expense of changing rear ends I would go down in the 264 range. That 336 just won't make that big of a difference.
     
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  4. AModelCat

    AModelCat Road Train Member

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    What little fuel economy you might gain vs the cost of re-gearing is most likely a waste of time. I'd just run it until a diff is ready to blow and do it then.
     
    Socal Xpress and DUNE-T Thank this.
  5. tnevin225

    tnevin225 Road Train Member

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    What is your current fuel economy? I think the problem might be more the D16 than the rear ends. And does the truck match up to the trailer or is it a mid roof.
     
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  6. DUNE-T

    DUNE-T Road Train Member

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    I tried this experiment and my mpg got worse due to the tall rubber
     
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  7. DUNE-T

    DUNE-T Road Train Member

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    Double this
     
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  8. 062

    062 Road Train Member

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    You most likely didn’t need to drop rpm’s as may be the case with the op.
     
  9. AModelCat

    AModelCat Road Train Member

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    I think you nailed it. No need for a big 16L engine when you aren't even pulling legal weights.
     
  10. sbreeden

    sbreeden Bobtail Member

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    I'm getting 5.5 hilly, flat 6.3, I got a good deal on the truck, no issues for $23k. I didn't think much about mpg when getting it, just that I could pay for it out right. Now that I'm pulling it and seeing half my settlements going out the stacks, it becoming more of a burden than a money maker. I can get a set of rears that match the trans for $2000, then have the speedo reprogram.

    It a mid roof, I order the roof wing last week, running tall tires.

    Just fishing for ideals for make the more efficient.

    Thanks
     
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