13 speed shift knob air lines

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by W Bench Farms, Jan 7, 2022.

  1. W Bench Farms

    W Bench Farms Light Load Member

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    I'm in the process of a 10 speed to 13 speed swap. Have everything ready to go, and hooking up the airlines to the shift knob. I'm running into an issue here. I have everything hooked up correctly to the knob by the book. However, I am getting air back to the shift knob to the H/L line when on the low side. This line should have air to it when on the high side, so that there is air to the splitter. This is on a 16913a, but an early model non-Halo. I'm wondering if there was an early version shift knob that may have the air going to the P port when in high instead of low. I'm at a loss on this one.
     
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  3. W Bench Farms

    W Bench Farms Light Load Member

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    I'm doing some research, and I'm wondering if this is not a 15 speed instead of a 13 speed. No tag. The salvage yard I purchased from verified it was a 13. So, if this is the case, and it is a 15, I know I'll need a different shift knob. What is this going to do to my ratios?
     
  4. Catmando

    Catmando Road Train Member

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    What are you running for gears and tire size ?
     
  5. W Bench Farms

    W Bench Farms Light Load Member

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  6. BoxCarKidd

    BoxCarKidd Road Train Member

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    Eaton Fuller transmission rations: It lists them all but there are many possible that look the same.
     
  7. bjytech

    bjytech Light Load Member

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    Have any pictures of the trans and the air setup that is on it? I may be able to tell from them.
    If it is a 15 speed you will know once you start driving it, on a 15 the top gear is over and up towards the dash, where a 13 speed it is over and back away from the dash.
     
  8. W Bench Farms

    W Bench Farms Light Load Member

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    Not sure if you can tell from this picture, this is the only one I have at the moment.
    What is making me think it's a 15 is that I have air on the h/l line back to the shift knob when in low, not in high like a 13 should be. I have a new A6913 shift knob on it now.
    It's making me sick thinking I'm going to have to pull it.
     

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  9. BoxCarKidd

    BoxCarKidd Road Train Member

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    A 13 SPD OD supply line should feed off the top of that type slave valve not the bottom.
     
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  10. AModelCat

    AModelCat Road Train Member

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    Not all 15 speeds have top gear against the dash.
     
    Roger McG and BoxCarKidd Thank this.
  11. bjytech

    bjytech Light Load Member

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    cant really tell much from that picture, looks like it may be a 15 but would need to see the back side(output shaft side) to be sure, a 15 speed will have a combination range/splitter fork housing where a 13 or 18 would have separate housings for the range and splitter forks.
    15.jpg 13.jpg

    I stand corrected, Guess I haven't seen any of the 9 series 15 speeds yet.
     
    Last edited: Jan 8, 2022
    Reason for edit: added pictures
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