Post by BowtieGuy on Jun 25, 2004 18:16:26 GMT -5
This article will cover wiring the 700r4 to lock up without the ecm controlling it. First thing we need to do is get a power wire ran to the transmission with all the needed switches inline. There are several places to get a key activated hot wire from, if your truck has or had cruise control the easiest place will be at the brake switch for this. If your truck doesn't have cruise you will need to get the cruise switch that hooks to the brake pedal that looks like the brake light switch. Don't get the two confused, the brake light switch is switched to hot when brakes are applied, the cruise switch goes dead when brakes are applied. This is what we need. Find the power side out of the cruise switch and tie in a wire here, make sure you have a wire that will be plenty long enough. There are 2 options you can do from here. One is tie in a toggle switch for manual control of unlocking the torque convertor, and two is the factory vaccum switch to unlock the torque convertor. You can use both also but I recommend using atleast one if not both. If using the toggle switch you want to run the power supply wire from the cruise switch to the toggle switch now then out the firewall to engine bay, if not using the toggle switch the just run straight out to engine bay. If you plan to use the vaccum switch now is the time to tie it in the system. The factory vaccum switch is located on the firewall on the passenger side of the power brake booster just below the cowl. If there isn't a switch you can mount one anywhere you chose. Tie your power supply in then run the wire out to the transmission. If not using the vaccum switch you can just run straight to transmission. Now he have a power supply that is turned off a few ways.
1 - When brakes are applied, Strongly suggested
2 - When you turn it off with toggle switch, user control
3 - When vaccum drops below a switch specific piont
Now the fun part. Time to drop the transmission pan to rewire the valve body. One thing you will need, if not in the transmission already (various models where different so I can't say if you have it or not, I got one before I did mine to make sure I had one) This is a normally open switch, some models have a normally closed switch. The normally open switch needs to be placed in the 4th gear valve which is marked "A" in the reference photo below.
This switch will tell the system that the transmission is in overdrive and sends power to the TCC (torque convertor control) Back to wiring again, there is a 4 prong plug on the driver's of the transmission. It really doesn't really matter which one you tie into as long as you make sure you tie into the smae one inside the transmission. You want to run the power wire to one side of the normally open switch. Then from the other side of the switch you want to run to the TCC which is located behind the torque convertor inside the transmission pan. There are basically 2 types if TCC's, a self grounding and a non grounding TCC. If your using the self grounding it is fairly simply, run the power wire to the TCC. If your using the non self grounding TCC you need to find which one is the power side and tie your power wire into this. The ground wire can be ran to any bolt inside the vavle body to ground it. Then install a new filter while your in there, install the pan, and test drive to make sure everything works properly. If so then grab a beer and celebrate a job well done. If for some reason it isn't working trace down the wires and make sure your still getting 12 volts through the power wire and getting a good ground. If all this checks out to be good the you TCC switch must be bad.
1 - When brakes are applied, Strongly suggested
2 - When you turn it off with toggle switch, user control
3 - When vaccum drops below a switch specific piont
Now the fun part. Time to drop the transmission pan to rewire the valve body. One thing you will need, if not in the transmission already (various models where different so I can't say if you have it or not, I got one before I did mine to make sure I had one) This is a normally open switch, some models have a normally closed switch. The normally open switch needs to be placed in the 4th gear valve which is marked "A" in the reference photo below.
This switch will tell the system that the transmission is in overdrive and sends power to the TCC (torque convertor control) Back to wiring again, there is a 4 prong plug on the driver's of the transmission. It really doesn't really matter which one you tie into as long as you make sure you tie into the smae one inside the transmission. You want to run the power wire to one side of the normally open switch. Then from the other side of the switch you want to run to the TCC which is located behind the torque convertor inside the transmission pan. There are basically 2 types if TCC's, a self grounding and a non grounding TCC. If your using the self grounding it is fairly simply, run the power wire to the TCC. If your using the non self grounding TCC you need to find which one is the power side and tie your power wire into this. The ground wire can be ran to any bolt inside the vavle body to ground it. Then install a new filter while your in there, install the pan, and test drive to make sure everything works properly. If so then grab a beer and celebrate a job well done. If for some reason it isn't working trace down the wires and make sure your still getting 12 volts through the power wire and getting a good ground. If all this checks out to be good the you TCC switch must be bad.