why did they use too make 15 speed trannys then stop what were they made for if the use too makethem

Discussion in 'Experienced Truckers' Advice' started by piston757, Aug 17, 2019.

  1. piston757

    piston757 Bobtail Member

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    just wondering why they use too make 15 speeds then they stopped what where they made for off road or heavy heavy loads or is it a good nonstop on the road tranny like the 13 and 18 speeds I just want too know about that tranny
     
  2. starmac

    starmac Road Train Member

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    One of the toughest trannys there is, and great for anything you can do with a truck, You just have to shift every gear and do not have any half gears like a 13 or 18.
     
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  3. AModelCat

    AModelCat Road Train Member

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    Its basically a 10 speed but with a 3 speed aux section instead of a 2 speed. Its called a 15 but in reality if you started in the lowest gear and progressively hit every gear you'd only use 12 gears. You'd shift through all 5 in deep reduction, flip the blue button to go into low range and shift to 4th in the main box. Then you'd hit 5th, flip the range selector and then shift all 5 in the main box. 3 of the ratios overlap, so they aren't actually useable if you were to shift the way I describe. In most cases I'd just drive it like a 10 unless you needed to start out in a hole or on a steep grade.
     
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  4. starmac

    starmac Road Train Member

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    Yep on pavement it is a 10 speed, unless you are having to start a heavy load on a serious grade. On a typical interstate freight truck, you would not use the deep reduction gears much at all, and even if you do, you don't need to go through all five in it, just shift three change range and go back to the last gear you were in.
     
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  5. piston757

    piston757 Bobtail Member

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    o ok and just to make sure I got it right bc I can just start at 6th and drive it like at 10speed unloaded but if I have a load on it then would I have too use any of the first 5 gears or could I still start in 6th gear just making sure and thank yall for the replies also they made the 15 speed for heavy loads y did they stop making it and is it a good long haul tranny?
     
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  6. dibstr

    dibstr Road Train Member

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    Why do you think they have quit making them? Fuller has 5 or 6 series of 15 speeds still in production.

    Deep reduction is labeled 1-5, direct 1-5 and 6-10. If you do not use D/R you would usually start in 1st or 2nd direct, not 6th.
     
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  7. AModelCat

    AModelCat Road Train Member

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    Just don't put it in deep reduction and start out in low range. Pretend the blue button isn't even there. It has an interlock similar to the 13 speed. If deep reduction is selected you will not be able to lift the range selector switch.
     
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  8. starmac

    starmac Road Train Member

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    Low is not actually6th even if you go through all the gears in deep reduction. If you do go through all 5 gears in deep r, you shift from 5 back to 4 in low range. if you just use 3, then you shift back to 2cnd, if that makes sense, it is easier to show someone than it is to tell them. lol
    Is yours up against the dash in high gear or normal?
     
  9. piston757

    piston757 Bobtail Member

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    ya mines up against the dash and ok thanks for input
     
  10. piston757

    piston757 Bobtail Member

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    also if I have my own truck and my cdl but no experience should I work for a company with my truck or use a freight broker or load borads with no experience I know that's wer the bigger money and all that is so I bought and now own a payed off 1996 Peterbilt 379 EXHD what do I do after I get insurance and all that stuff where do I start working or get work
     
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