TC Lock Up Switch - Ford Powerstroke Diesel Forum
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Old 01-27-2014, 10:10 PM
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TC Lock Up Switch

Ok this may be a stupid question that's been asked a lot but what is a TC lock up switch, what does it do, and what is the reason behind it. Just a few things that have been floating around in my head.

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Old 01-27-2014, 11:59 PM
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The lock up switch is a switch that locks up the torque convertor. It is mainly used by sled pullers to get the most power to the ground. It is not wise to run a lock up switch while driving in the street allowing the tq to stay locked all the time because it can be very hard on the trans and its internals.
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Old 01-28-2014, 05:23 PM
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Another dumb question.... Can the trans shift with Tc locked? Is it just really hard on trans?




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Old 01-28-2014, 09:15 PM
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People also use them a lot for towing. It can help act as an engine brake. Usually the torque will unlock about about 38 MPH. When the torque converter unlocks, the truck can free roll like its in neutral. When towing and coming to a stop, You want to be able to keep the torque converter locked for longer so the engine can retard the truck instead of using brakes. Just make sure to unlock the converter though when your speed/RPMs get too low, or you will stall the engine just like in a manual.

Last edited by peter379; 01-28-2014 at 09:21 PM.
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Old 01-30-2014, 07:04 PM
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Quote:
Originally Posted by Pbguy420 View Post
Another dumb question.... Can the trans shift with Tc locked? Is it just really hard on trans?




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Yes this is exactly what I was talking about. Even if your "custom tune" makes your tq convertor lock up when the trans shifts it does release it and once the trans shifts it re-locks the convertor. It does also work very well while towing but I wouldn't recommend keeping it locked while the trans is shifting up and down.
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