Torque converter lock up switch pros and cons - Diesel Forum - TheDieselStop.com
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99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 03-04-2007, 07:45 PM   #1 (permalink)
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Torque converter lock up switch pros and cons

I am thinking about putting in a lock up switch and I would like some feed back from others.

First off does it still lock up the same as when the onboard computer tells it to.

I know that you shouldn't use it at low rpm, but what other problems come with it.

Do you let out of the gas when you are locking it up.
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Old 03-04-2007, 09:59 PM   #2 (permalink)
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Re: Torque converter lock up switch pros and cons

[ QUOTE ]
I am thinking about putting in a lock up switch and I would like some feed back from others.

First off does it still lock up the same as when the onboard computer tells it to. <font color="blue"> Only if you don't turn it on before that. It will lock when you throw the switch. I usually wait for the PCM to lock it up and then throw the switch to keep it locked.
</font>
I know that you shouldn't use it at low rpm, but what other problems come with it. <font color="blue"> You just have to remember to turn it off at about 1000-1200 RPMs when coming to a stop.
</font>
Do you let out of the gas when you are locking it up. <font color="blue"> I always do so that it locks smooth instead of slamming into lock. </font>

[/ QUOTE ]

Hope this helps, Joe
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Old 03-05-2007, 06:51 AM   #3 (permalink)
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Re: Torque converter lock up switch pros and cons

I have one fitted and use it mainly when I am below 75-80 KMPH where the PCM will lock it up anyway.
Use it for slow speed work on bush tracks etc where if used as supplied the convertor is creating a lot of heat slipping.I ease of on the go pedal when engaging and you need to always unlock it. It will stall the motor if not unlocked and is embarrasing.
Regards
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Old 03-10-2007, 11:47 PM   #4 (permalink)
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Re: Torque converter lock up switch pros and cons

Lets say I have it locked up in second gear and its going to change into third gear soon, do you just leave the lock up switch on or should I turn it off.

Thanks
Matt H
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Old 03-11-2007, 03:36 AM   #5 (permalink)
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Re: Torque converter lock up switch pros and cons

Once locked leave it... It will down shift and upshift without any help from you.
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Old 03-11-2007, 04:24 PM   #6 (permalink)
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Re: Torque converter lock up switch pros and cons

[ QUOTE ]
Lets say I have it locked up in second gear and its going to change into third gear soon, do you just leave the lock up switch on or should I turn it off.

Thanks
Matt H

[/ QUOTE ]

Matt, once your rolling you can flip the switch in first gear if you really wanted to. It will shift normally right on up through the gears. When its locked and you begin coming to a stop, thats when youll have a problem. If you forget to unlock it at very slow speeds it will buck like a bull and probably stall the engine. This of it like a manual trans at a stop light. If you dont step on the clutch to disengage it will kill the engine. Pretty much the same with the TC.
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Old 04-01-2007, 09:17 PM   #7 (permalink)
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Re: Torque converter lock up switch pros and cons

I should have done this much sooner. It works perfectly for my towing needs.
I remember someone saying something about what rpm to stay above for pump reasons is that 1200 rpm or is that higher.

Thanks
Matt
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Old 04-01-2007, 10:27 PM   #8 (permalink)
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Re: Torque converter lock up switch pros and cons

Staying above 1200 RPM will be fine. Below that there may not be enough pump capacity to keep the torque converter clutch from slipping.
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