Heavy Spec Tractor

Discussion in 'Heavy Haul Trucking Forum' started by flat-step, Sep 27, 2018.

  1. flat-step

    flat-step Light Load Member

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    May 11, 2011
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    Hello all,

    I finally got the delivery of my new 55 ton trailking but my hunt for a heavy spec tractor is still on. Just wanted to reach out to all the heavy haul guys who are hauling a 55 ton trailer with a single axle jeep behind a tandem drive tractor. My question is if anyone out there has a regular(non heavy haul tractor, no double frame, no 46000 rears) hauling a single axle jeep setup with a 55 ton trailer? i have 2 tractor with 550 horse cummins but they are non heavy haul specs. I;m actively looking for a tractor which suits my needs but till then i will be using my new 55 ton trailking with a single axle jeep. Just wanted to know how many of you are doing that with causing serious damage to the tractor, Thank you all in advance for your input and stay safe out there.
     
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  3. shoe128

    shoe128 Bobtail Member

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    Jun 30, 2018
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    If I'm reading you rt it shouldn't be a problem if you don't horse it to much,I used a not so heavy spec trk for year's.it worked well for me.
     
  4. m16ty

    m16ty Road Train Member

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    IMO, the main thing would be what trans you have. 13 or 18 speed would be best, a 10 speed not so good.

    There are plenty of single framed, 38K rear trucks pulling 55 ton trailers. Just don't dog it and it will be fine.
     
  5. flat-step

    flat-step Light Load Member

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    May 11, 2011
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    It's a 18 speed with a 3:73 rears. I plan to change the rear end to 4:10 so it doesn't bog down in the hills. Thanks m16ty
     
  6. flat-step

    flat-step Light Load Member

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    May 11, 2011
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    Thank you for your reply
     
  7. m16ty

    m16ty Road Train Member

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    You should be fine with that setup, I've seen people do a lot more with a lot less.

    With the 18 speed I wouldn't even worry about changing the rear ratio.
     
  8. heavyhaulershotcaller

    heavyhaulershotcaller Light Load Member

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    Sep 1, 2017
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    I have not personally ran a light spec truck on 8 axles, but know a couple of guys that have. They were actually normal road truck 379 Petes with an added pusher axle, 12k steer and 40k rears. From what I learned from them between the two that you may be ok with 3.73 ratio depending how much you run in the mountains and what your tire size is. A low pro 22.5" (295/75R/22.5) tire with 3.73 ratio is about the same gearing as running 11R/24.5" tires with 4.10 ratio. I would try running what you have first to see how it performs.
    If running mountains a bit make sure your rear end gauges work. One of the guys I know said his rear ends would overheat whether he was going uphill or down. Why downhill is because of running jakes (I guess). He ended up non-synthetic gear oil because it was cheaper and changed it quite frequently from all the heating cycles.

    Congrats on the new Trail King. They build an awesome trailer.
     
    Oxbow Thanks this.
  9. flat-step

    flat-step Light Load Member

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    May 11, 2011
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  10. shoe128

    shoe128 Bobtail Member

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    I used 373 for years up to 220000 the unless you are going higher than that . If you're going 250 300 thou than put in a 2 speed rear
     
  11. flat-step

    flat-step Light Load Member

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    May 11, 2011
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    Thank you.
     
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