Does ultra shift clutch actuators fit 8ll

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by tnc110, Oct 22, 2019.

  1. tnc110

    tnc110 Light Load Member

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    Does anyone know if the electronic clutch actuator from a ultra shift or auto shift fits an 8ll trans?
     
  2. BoxCarKidd

    BoxCarKidd Road Train Member

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    It appears the world may never know. You may need to list model numbers. I did put a bell housing off a 14 series 13 speed on a 16 series 3 pedal awful shift. Housings seem to be universal. It may work. What exactly are you wanting to do?
     
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  3. tnc110

    tnc110 Light Load Member

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    I injured my clutch leg and can’t handle to force required to push in the clutch. I was hoping to rig a reostat to the clutch pedal and have a very light clutch pedal.
     
  4. BoxCarKidd

    BoxCarKidd Road Train Member

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    I cannot answer all of that for you. However if I were in your situation I would look for set up like Autocars used in the late 80,s. It had a hydraulic master cylinder on the firewall. The transmission top plate had a hydraulic over air unit bolted to it. It functioned the clutch shaft arm.
    You can probably push a pedal down on one of those with a couple of fingers. I bought a master cylinder for one of those in the last 6 months.
    That would probably require some bone yard parts. Then have to figure out the master cylinder deal.
    Best I remember and just sharing the idea. Maybe someone else has a better one.
     
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  5. tnc110

    tnc110 Light Load Member

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    Interesting. Thank you
     
  6. pushbroom

    pushbroom Road Train Member

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    ECA's on ultrashifts require different bell-housings and clutches to work. They are also a smart component, not just a on-off control. Best bet is a easy pedal clutch or some type of hydraulic/ air assist. On old school vac trucks I have seen air actuators hooked to the clutch linkage however I would not do that for on road and the DOT would eat you alive if they saw it. What model/type of truck
     
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  7. BoxCarKidd

    BoxCarKidd Road Train Member

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    Thanks for the education. The ones I referred to were factory hyd / air assist units. Easy pedals are great but I got pretty good at using my right foot on the clutch at one time.
     
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  8. AModelCat

    AModelCat Road Train Member

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    The 90's WhiteGMC/Volvo Autocar had a factory option for an air assist clutch. Sales brochure (which I probably still have stashed away somewhere lol) claims clutch pedal effort was reduced to 30ish lbs. I did work on one years ago and remember the pedal effort was pretty low. Never looked at the linkage on it but judging by the little bit of lag time I'd have to guess it was completely air actuated. Must've had some kind of porportioning air valve attached to the pedal maybe?
     
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  9. pushbroom

    pushbroom Road Train Member

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    Pete 579 hydraulic/air clutch could be pressed with one finger. crazy easy
     
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  10. BoxCarKidd

    BoxCarKidd Road Train Member

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    That would be easier to get parts for but they were never inexpensive. The actuator on those Autocars was over $200 in the early 90's. They did not fail often.
    If you have a good truck but just need some clutch pedal relief I would look into that.
     
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