3.42

Discussion in 'Ask An Owner Operator' started by Abusumeyo, Jul 20, 2012.

  1. MNdriver

    MNdriver Road Train Member

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    jeez ain't that the truth....
     
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  3. Starline

    Starline Medium Load Member

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    New tires, $4,000 - $5200 depending if you get national discount or not... You NEED tires, so replace them with a smaller size after the originals are worn. Reman/rebuilt set of chunks, PD $2500 -rear $1900 then you have install costs.
     
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  4. russtrucker

    russtrucker Road Train Member

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    I noticed when i drove 05 volvo with 3.55 and 465 hp. It gain speed uphill than 09 cascadia with 3.42 that has 455 hp
     
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  5. Cowpie1

    Cowpie1 Road Train Member

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    I always hated 3.42 in any trucks I drove that had it. I didn't give it a lot of thought when I bought my 2013 Silverado pickup, but it came with 3.42 also. I have no clue what is with the love fest between OEM's and 3.42. It sucked in the class 8 trucks I drove that had it, and it sucks in my pickup.
     
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  6. russtrucker

    russtrucker Road Train Member

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    I love 3.70 on my mbn t600. Gains speed uphill and will hold on the same speed up hill. I just want to know if you can even gain good mpg on 3.70.
     
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  7. RBTINC

    RBTINC Bobtail Member

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    Mar 30, 2018
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    Is a Cummins ISX, 13spd and 3:42 rears a good setup?
     
  8. Cowpie1

    Cowpie1 Road Train Member

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    I had one, and I didn't like it. Guess it depends on the application. I didn't have good results in terms of both pulling power or fuel economy. I found the same thing with a Chevy pickup that had 3.42 in it. I have come to the conclusion that 3.42 has to be one of the worse overall ratios around. But then again, it might be ok in some situations. I just haven't experienced one of those situations.
     
  9. nutcase

    nutcase Light Load Member

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    May 2, 2010
    Meridian, ID
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    Depends on what your application is and how you drive it. But that is true with any reasonable drive train setup.

    I have driven two different truck with that basic setup. One was an '04 with a 565 hp ISX, the other an '07 with a Volvo D12 455hp. Both got 7 mpg+ running over the road. Most of my loads are pretty light though.
     
  10. ChicagoJohn

    ChicagoJohn Road Train Member

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    Chicago
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    I like my 3.42 so far. I just came out of a Mack with 3.55 11R22.5 tires 13spd to a 3.42 275R22.5 10spd and the rpm is exactly the same, 1500 @ 70. I don't like the 10spd, but that's a different story. So far, I'm satisfied with the pulling power I have, but I'm not a speed racer of the line either.
     
  11. DougA

    DougA Road Train Member

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    Retired,In my shop in Md.
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    Tall rubber was 11R24.5.At least it always was for me. Every truck I ever owned had 10.00-22,tube in the old days,and then when we went tubeless,it was 11R 24.5 same height.
    10.00-20 tube,11.22.5 tubeless was the short rubber.
     
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