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  1. simp5782

    What exactly does the torque converter lockup switch do?

    Bad solenoid will unlock itself while cruising and coasting and then relock when throttle is applied. I think there are 2? I'm assuming this is a 4L80. You could drop the pan and make sure the harness isn't rubbing.
  2. simp5782

    What exactly does the torque converter lockup switch do?

    Shouldn't lock until 45mph or more. You can get a controller and lock it whenever you want. https://www.steelsoldiers.com/threads/at-what-speed-does-the-torque-converter-lock-in-a-4l80e-trans.183603/
  3. simp5782

    What exactly does the torque converter lockup switch do?

    When a torque converter locks up, it inherently lowers rpm's because the slippage that happens in the converter is minimized, hence "locked".
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