tc lock up mod
 

im wanting to do a tc lock up mod, i was looking around and ive read i could run a ground wire to a switch and just splice it into a purple w/ yellow tracer wire under the master cylinder and that will lock the tc when i want to and still allow the computer to lock it when it needs to, is this correct?

No you need to do it with a relay and stuff. If you do it that way you can send 12v back to the pcm and fry it

okay so how would i go about doing this? i know I'm not the smartest person, but how could i send 12v to the pcm if I'm running a ground wire? there wouldn't be any power running through the switch,

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oh and also i just hooked up my EBPV to be an exhaust break, now would i be able to hear a difference between it being open and closed at idle?

Well when you splice into the tc wire its gonna go to the trans and the ocm when you turn it on. And yes youll hear it at an idle

okay, so how would i go about wiring this thing up? what should i hear when i close the valve?

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and are you able to drive with the valve closed?

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so does anybody else know how to wire up the tc lock up mod????

It will be a loud woosh. Cant miss it with your stacks. I wouldnt hit the gas you can use it as an exhaust brake if the tc is locked. I have a diagram I made with a guy. Can follow it if you want be careful and dont blame me if you fry a pcm haha/ All I remember for parts you need is a double pole double throw relay and a 22k resistor or something close to that.

Attachment 43911

okay thank you, i wasnt saying i didnt want to do it your way, i was just wondering if anybody else how to do it,

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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?

Im not too good with electrical. Not sure. I think that causes the o/d light to flash then its locked when pcm thinks it shouldnt be. I am not an electrical guy, I just put a retifier diode and hooked my pcm back up to the ebpv valve so the pcm can still actuate it but that isnt working either its got me stumped.

okay, thank you, i guess im goin with your picture haha, im not about to fry anything and ruin my truck haha

So I know the OD light will flash if the TC is locked and the PCM did not command it to, but will it also flash if the PCM doesn't get a signal when it DID command it to lock? (i.e. diode in the purple/yellow wire between PCM and added switch) A diode would allow the PCM to send it's signal to the trans to lock TC, but not back to the PCM when locked. :humm: