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<update with pics> Sensor on TH350 transmission?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by anatomiczero, Jan 20, 2002.

  1. anatomiczero

    anatomiczero 1/2 ton status

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    I'm curious, There's I believe is a sensor on the driver's side of the transmision and it has a wire coming off of it. Well the wire is cut and just wrapped around a hose. I pulled the sensor out and there's two plastic prongs with a conductor in the middle of one. What is this for and does it make a difference that it's not hooked up?


    I got a digital camera, here's some pics-

    http://home.attbi.com/~anatomiczero/jimmy/images/th350_angle2.jpg
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    80' GMC Jimmy 4x4, 350-TH350-NP205<P ID="edit"><FONT class="small">Edited by anatomiczero on 02/24/02 03:19 PM.</FONT></P>
     
  2. anatomiczero

    anatomiczero 1/2 ton status

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    Re: Sensor on TH350 transmission?

    &lt;bump&gt;

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    80' GMC Jimmy 4x4, 350-TH350-NP205
     
  3. Burbinator

    Burbinator 1/2 ton status

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    Re: Sensor on TH350 transmission?

    Sounds like the lock-up trigger for the torque converter from the distributor. Unhooked, it is basically acting like a non-lockup variant.

    The advantage of the lock-up is it is more efficient on the highway. When you are in third gear and the RPMs get to a certain level, the distributor triggers the torque converter. This makes the transmission work at a straight 1:1 with no lost power from torque converter slippage.

    Haze gray and underway...<font color=blue>or blue, in my case.</font color=blue>
    <a target="_blank" href=http://community.webshots.com/album/26246038MbQsYWKcbo>U.S.S. Nimitz II</a>
     
  4. anatomiczero

    anatomiczero 1/2 ton status

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    Re: Sensor on TH350 transmission?

    Thanks for the idea, I didn't see anything from the distributor, I'll check some more tomorrow.

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    80' GMC Jimmy 4x4, 350-TH350-NP205
     
  5. dyeager535

    dyeager535 1 ton status Premium Member

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    Re: Sensor on TH350 transmission?

    For awhile GM used some kind of system for emissions that had to do with gear selection and timing. Yours is either that or for lockup, I've never seen an "early" lockup plug though. Later ones are square with positions for 4 wires.

    Dorian
    My tech/links page: <a target="_blank" href=http://www.dorianyeager.com/index2.html>www.dorianyeager.com/index2.html</a>
    Why insist on counting when the ring gear has the tooth counts stamped in?
     
  6. ZZ4x4

    ZZ4x4 1/2 ton status

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    Re: Sensor on TH350 transmission?

    I've got an older TH350, and the single wire was for the TCS system which was connected to a solenoid circuit on the carb which would cut vac advance when trans is in a certain gear. So.. the wire tells the system what gear the trans is in. It is for emissions and I scrapped the system. It is a 1971 though, so I'm not sure yours is the same, but I assume so. JT
     
  7. anatomiczero

    anatomiczero 1/2 ton status

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    Re: Sensor on TH350 transmission?

    Thanks for the replies, I'm not gonna worry about it if it's just for emissions.

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    80' GMC Jimmy 4x4, 350-TH350-NP205
     
  8. anatomiczero

    anatomiczero 1/2 ton status

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    pics are on first post.

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    80' GMC Jimmy 4x4, 350-TH350-NP205
     

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