tc lock up mod - Ford Powerstroke Diesel Forum

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post #1 of 60 Old 12-21-2010, 05:19 PM Thread Starter
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tc lock up mod

so does anybody know how to wire up the tc lock up mod? im needing to do this since im making my EBPV into an exhaust break

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post #2 of 60 Old 12-21-2010, 06:24 PM
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look in the engine compartment, on the driverside fender well there is 4 connectors IIRC its the one toward the front of the truck and there is a Purple w/ yellow trace wire. you tap into that wire, run it into the cab to a switch, ground the other side of the switch, it may cause your OD light to flash, and throw a P0741 code because the PCM wants the TC unlocked while its manually locked. also dont keep it locked under 25mph

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post #3 of 60 Old 12-21-2010, 06:52 PM Thread Starter
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i was told i couldnt do that cause i might send 12 volts to the pcm and fry it?? anybody know if this is true or not?

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post #4 of 60 Old 12-21-2010, 08:11 PM
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check out the tech files there is a link there. good luck try not to fry anything and do it right

1/30/98 EARLY 99 7.3 F350 DRW CC 4X4 4R100 3.73 LARIAT
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post #5 of 60 Old 12-21-2010, 08:37 PM Thread Starter
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i got to thinking, could i splice a ground into that wire, and put a diode after the splice so 12volts couldn't run back through the system? like wire a ground to the switch and cut the wire under the dash, and wire them together, then connect a diode to it and connect the other end of the diode to the wire going to the tranny, would that keep it from frying the computer?

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post #6 of 60 Old 12-21-2010, 09:02 PM
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the way i said to do it has no 12volt current at all, so its safe, the way you are thinking of has a setup to keep the OD light from flashing.

all your doing is grounding out the TC lockup solinoid. no power at all

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post #7 of 60 Old 12-21-2010, 09:14 PM Thread Starter
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how long have you been running your truck this way? and whats thee lowest mph and rpm to have this on?

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post #8 of 60 Old 12-22-2010, 03:54 AM
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freeeride is correct. Its just grounding out the wire. I have been running this for a long time. Yes, it will flash the OD light when its on but no big deal. The way your talking about doing it with diodes and such will stop the soft codes and OD light flash as freeride said. Its a bit more complex...look here Welcome to guzzle's TC Lockup Mod Web Page

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post #9 of 60 Old 12-22-2010, 08:31 AM Thread Starter
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okay, so whats the lowest mph and rpms i could run this at? and how do i test it to make sure its working rights after i hook it up???

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post #10 of 60 Old 12-22-2010, 10:59 AM
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You WILL know if if it's working when you flip the switch. Put it in gear and while stopped, flip the switch. It ought to kill the engine dead instantly.


I wouldn't command a torque converter clutch apply at anything below 1500 RPM.
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