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1st gen Tranny question

Discussion in 'The Garage' started by Stroked72Blazer, Oct 18, 2003.

  1. Stroked72Blazer

    Stroked72Blazer 1/2 ton status

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    I have a (Senser?) type plug just above where the dipstick goes in. It has two male spaid plugs on it. What the heck is it? Or has someone just swapped in a later model tranny with a lockup converter or something like that?
     
  2. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    I believe that is part of a smog device that was used early on and it works in conjuction with an electric/vacuum solenoid and vacuum lines to the distributor.
     
  3. Blazer1970

    Blazer1970 1/2 ton status

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    4X4HIGH is correct, it is a high gear indicator switch for the TCS (transmission controlled spark) system. It indicates that the tranny is in 3rd gear. I seldom see a truck that still has the TCS system intact, so you can likely just ignore it.
     
  4. Stroked72Blazer

    Stroked72Blazer 1/2 ton status

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    Cool Thanks. Does anyone know the thread size so I can just put a plug in it? Is it pipe thread or regular?
     
  5. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    I haven't seen one in a long time but I believe it is 1/8" pipe.
     

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