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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

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  #1  
Old 11-19-2007, 03:58 PM
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Skandocious Skandocious is offline
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Torque converter clutch lockup switch

I know this has been covered before, and I bookmarked the thread, but I've got another question. I'd like to install a torque converter clutch lockup switch that will allow me to lock the converter at any speed/RPM but I'm a bit confused as to how the electrical circuit works. The torque converter is UNLOCKED when it has +12v to it and LOCKED when the voltage is removed? Or vice versa? Thanks.
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Old 11-19-2007, 05:20 PM
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Quote:
Originally Posted by Skandocious
I know this has been covered before, and I bookmarked the thread, but I've got another question. I'd like to install a torque converter clutch lockup switch that will allow me to lock the converter at any speed/RPM but I'm a bit confused as to how the electrical circuit works. The torque converter is UNLOCKED when it has +12v to it and LOCKED when the voltage is removed? Or vice versa? Thanks.
Nethier.
The clutch is on when grouned, off when not grounded.

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Old 11-19-2007, 05:27 PM
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what is the point of this mod
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Old 11-19-2007, 05:37 PM
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Originally Posted by 17fordguy
what is the point of this mod
It allows him to manually lock the converter rather than having it slip.
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Old 11-19-2007, 05:39 PM
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Quote:
Originally Posted by Skandocious
I know this has been covered before, and I bookmarked the thread, but I've got another question. I'd like to install a torque converter clutch lockup switch that will allow me to lock the converter at any speed/RPM but I'm a bit confused as to how the electrical circuit works. The torque converter is UNLOCKED when it has +12v to it and LOCKED when the voltage is removed? Or vice versa? Thanks.
The solenoid always has 12 volts to it. The ECU provides the ground when it wants to lock the converter.
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Old 11-19-2007, 05:44 PM
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So then installing a switch inline on that wire would only allow me to UNLOCK the converter when it has been locked already be the ECU, by breaking the ground. No? If I wanted to lock the converter on command then I'd need a three way switch with the center prong running to ground, no? But then I wouldn't be able to restore the originial circuit...
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Old 11-19-2007, 06:03 PM
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To UNLOCK the converter you would break the connection between the ECU and the transmission. This site has a good diagram with LEDs for ya.

http://www.forgotton.net/mods/tclock/index.htm
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Old 11-19-2007, 06:25 PM
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Quote:
Originally Posted by Skandocious
So then installing a switch inline on that wire would only allow me to UNLOCK the converter when it has been locked already be the ECU, by breaking the ground. No? If I wanted to lock the converter on command then I'd need a three way switch with the center prong running to ground, no? But then I wouldn't be able to restore the originial circuit...
No center goes to the transmission.

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Old 11-19-2007, 06:33 PM
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Ahhh yes it makes sense now!! You guys are awesome. Chris I gave you rep points but Bill I can't give you more until I "spread it around". Thanks you guys.
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Old 11-19-2007, 06:33 PM
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What are the benefits of manually locking/unlocking the torque converter? I have no clue about how this works. When its locked what does it do? Sorry to thread jack
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Old 11-19-2007, 06:38 PM
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Quote:
Originally Posted by Skandocious
Ahhh yes it makes sense now!! You guys are awesome. Chris I gave you rep points but Bill I can't give you more until I "spread it around". Thanks you guys.
That is OK, it seams like almost no body in the 1987 - 1996 F150 And Larger F-Series Trucks forum likes to give rep points. As long as I have been on here and as many posters that I have helped I only have 159.
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Last edited by subford; 11-19-2007 at 06:40 PM.
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Old 11-19-2007, 06:54 PM
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I know Bill it kinda sucks... I know I'm not nearly as knowledgable as you but when I actually DO know something, I don't get the rep for it...

Playa_fl, click on Chris's link above and it explains the benefits of the TC lockup switch at the bottom of the page.
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Old 11-19-2007, 06:56 PM
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Quote:
Originally Posted by Playa_fl
What are the benefits of manually locking/unlocking the torque converter? I have no clue about how this works. When its locked what does it do? Sorry to thread jack
The computer will lock the transmission to the engine at about 43 MPH using a lock up clutch in the TC for better MPG.

If you have the Mod it can be used for towing above about 25 MPH and engine braking. This can also keep the oil cooler in the transmission.
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Last edited by subford; 11-19-2007 at 06:59 PM.
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Old 11-19-2007, 06:56 PM
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