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post #1 of 17 Old 03-30-2008, 07:54 PM Thread Starter
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TC Lock Tech Question

I don't expect many people to know this one, hopefully though someone on here has a bit of experience and knowledge about the electrical system on these trucks.

Its my understanding that when you do the manual TC lockup mod, in order to make the OD light not flash, you have to fool the PCM into thinking it still has control of the TC. You do that by feeding it a resisted 12v signal.

Now my question. Since that works for tricking the PCM when manually locking it, does the same thing apply for a manual unlock? If i wire it so it sends the same resisted 12v when manually unlocked as when it is manually locked, will it keep the OD light from flashing? Or will I fry my PCM? Or will it just do nothing and flash anyway?

Can anybody help me on this one?

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Yeah, I'd probably feel a bit drained after firing twice in rapid succession.
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post #2 of 17 Old 03-30-2008, 08:20 PM
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Good question, I don't have an answer. But I am curious on why you would want to manually unlock the TC?

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post #3 of 17 Old 03-30-2008, 08:23 PM Thread Starter
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For sled pulling. I've heard that you can do better if you keep the TC from locking. I think it was CSIPSD that told me that he has his set up so he can manually lock or unlock the TC. He said his OD light flashes though, im trying to figure out how to make it not flash.

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post #4 of 17 Old 03-30-2008, 08:25 PM Thread Starter
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nope, it was strokin_early_99 that told me about it.

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post #5 of 17 Old 03-30-2008, 08:52 PM Thread Starter
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Common, someone's gotta know.

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Yeah, I'd probably feel a bit drained after firing twice in rapid succession.
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post #6 of 17 Old 03-30-2008, 08:57 PM
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I think you could add another relay to provide the PCM with a resistive load, and break the connection with the TC. The reason the OD light flashes is the PCM thinks there is a fault in the TC lockup circuit, provide it with the nessesary resistance, and it should be happy.

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post #7 of 17 Old 03-30-2008, 09:00 PM Thread Starter
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Quote:
Originally Posted by alberta 7.3 View Post
I think you could add another relay to provide the PCM with a resistive load, and break the connection with the TC. The reason the OD light flashes is the PCM thinks there is a fault in the TC lockup circuit, provide it with the nessesary resistance, and it should be happy.
Thats what i was thinkin about doin. So basically as long as i have the resisted load going to the PCM, i can have it manually locked or unlocked and it wont flash?

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Quote:
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Yeah, I'd probably feel a bit drained after firing twice in rapid succession.
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post #8 of 17 Old 03-30-2008, 09:01 PM
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Yup it was me. I sled pull with the TC manually unlocked plus my DP tuner has the lockup set at 47mph. Like I would ever hit 47mph in 4low on the sled pull track but I like redundant systems...LOL

I have also used it to unlock the TC while towing in the mountains and I got stuck behind another RV. I needed a few more RPM to keep the EGT's in check with my old turbo setup. I just flipped the switch and the RPM increased about 900rpm and the EGT's dropped. FWIW, The trans never got over 185*.

The big thing is to never let the PCM see more then 5Volts. That is the maximum feedback voltage from any of the sensors on the truck. More than 5V and you will fry the PCM.

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post #9 of 17 Old 03-30-2008, 09:05 PM Thread Starter
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Quote:
Originally Posted by strokin_early_99 View Post
The big thing is to never let the PCM see more then 5Volts. That is the maximum feedback voltage from any of the sensors on the truck. More than 5V and you will fry the PCM.
So im assuming the 20,000 ohm resistor used in guzzles method takes it down to 5v? Don't they have diodes that limit voltage? which would be better?

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Quote:
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post #10 of 17 Old 03-30-2008, 10:20 PM
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wouldnt you still get a trans slip code?

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