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lock up torque converter

Discussion in 'The Garage' started by ChickenRammit, Aug 5, 2006.

  1. ChickenRammit

    ChickenRammit 1/2 ton status GMOTM Winner

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    what is the best way to figure out if my lock up torque converter selenoid is operating or not. i know some people can tell by listening, but is there some way to tell with a volt meter. if there is, which wires do i hook the volt meter to?
     
  2. ChickenRammit

    ChickenRammit 1/2 ton status GMOTM Winner

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  3. 1985_K5_Silverado

    1985_K5_Silverado 1/2 ton status

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    This isn't exactly what you requested, but these are easy ways to check if the TCC is locking up:

    If you have a tach, you could get on a steady, level cruise at near-highway speed, then tap the brake pedal very gently (keep the gas pedal depressed as if you were still cruising) and look for a rpm increase of around 2-400 rpm (or thereabouts) when the TCC disengages.

    If your exhaust isn't whisper-quiet, a sharp ear might pick out that same rpm increase when the brake pedal is tapped during a steady cruise.
     
  4. dyeager535

    dyeager535 1 ton status Premium Member

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    You should be able to FEEL the lockup converter engage. Count gear shifts while accelerating quite easily, you should feel the converter as the "5th" gear.
     
  5. Dallin

    Dallin 1/2 ton status

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    Often 700r4s are wired to lock the TCC in 4th only. This makes it difficult to feel the TCC lockup because it occurs just after the 3-4 shift. The lock up solenoid should read about 25 ohms. If your reading is significantly less the solenoid may have shorted out. You have to measure between 2 pins on the case connector or between one of the pins and the case itself. It just depends on how it is wired. As 1985_K5_Silverdo mentioned the best way to tell if the TCC is locking is to watch your RPMs and force it to unlock.
     
  6. ChickenRammit

    ChickenRammit 1/2 ton status GMOTM Winner

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    its actually a 4l60e mated to a 5.7 votec, but what dyeager just said answered my question, because i was driving and i felt what seemed like a 5th gear and i was wondering what the hell it was. thanks for the replies everyone, i feel a lot better now, knowing that i have it wire correctly.
     

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