Lowering a Peterbilt 379!!

Discussion in 'Trucks [ Eighteen Wheelers ]' started by EvilTrucker, Dec 16, 2008.

  1. Bparks285

    Bparks285 Bobtail Member

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    Did you change bags or do anything other than moving hangers up higher. I'm interested in doing mine
     
  2. x1Heavy

    x1Heavy Road Train Member

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    White County, Arkansas
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    Lowering the rear ends is not smart. First of all that 5th wheel needs to be a very small range of height above the pavement. Second of all you have a literal train of gears flowing power from the shaft back there, lowering the rears will cause you to suffer a failure back there that will totally explode your wallet.

    You will impose more stress on your freight. Shake it up even more. Maybe even shake something loose in that tractor if you havent already.
     
  3. Bparks285

    Bparks285 Bobtail Member

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    Sep 27, 2016
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    Wh
    what about the low low air leaf like on car haulers? I've heard the only difference was hangers mounted higher?
     
  4. x1Heavy

    x1Heavy Road Train Member

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    Car haulers are purpose built.

    If you took a tractor and lowered it many people say you need to accomodate the steering, alignments etc on the front and then the final drives on the rear.

    I did not say it's impossible. Just make sure when you drop that thing you do it proper so that all the drive train angles remain.
     
    AModelCat Thanks this.
  5. GrapeApe

    GrapeApe Road Train Member

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    That's the only difference in mounting, but that changes many other things. To check and adjust drivline angles, read the attached instructions.
     

    Attached Files:

    RubyEagle, BoxCarKidd and swaan Thank this.
  6. Bparks285

    Bparks285 Bobtail Member

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    Sep 27, 2016
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    10-4 on that, I got a real good alignment shop near me that I use and I'm gonna talk with them about the angles before I dive off moving stuff around
     
  7. dngrous_dime

    dngrous_dime Road Train Member

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    By lowering the truck, and thus the center of gravity, how much faster can you take on and off ramps???
     
  8. Bparks285

    Bparks285 Bobtail Member

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    I would get an overinflate switch to push the bags up
     
  9. little cat 500

    little cat 500 Road Train Member

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    why would you want it lower it's a truck not a gocart
     
    Oxbow, Pedigreed Bulldog and AModelCat Thank this.
  10. Bparks285

    Bparks285 Bobtail Member

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    Sep 27, 2016
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    Thanks for that. I will look over it. You wouldn't know if bags or anything else would need to be changed too?
     
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