700R4 Pressure Switch/wiring question - pics
#1
Burning Brakes
Thread Starter
700R4 Pressure Switch/wiring question - pics
Hello all,
I am working on my 700R4. The pan was still leaking after changing out yet another gasket so this time, I am changing the pan out as well. I had previously (years ago), installed a Complete Brake Switch Circuit for the lockup converter.
http://www.bowtieoverdrives.com/cata...php?ITEMID=332
Once I had the pan off I noticed that the 4-3 pressure sensor was still there but not hooked up to anything. The transmission was originally wired with a pressure sensor in both 4-3 and 4. As part of the kit, it had me replace the 4th gear pressure sensor. I can't find anything though that says what to do about the 4-3 pressure sensor.
Do I remove it and leave it open? (I don't think so, but I'm not sure)
Do I leave it in there? (Is it hurting anything?)
Do I remove it and plug it?
Original wiring:
New Wiring
I have not driven it very much yet, but I do not feel that it has ever gone into OD. I can only count 3 distinctive shifts while on the highway. I've been averaging 10 to 12 MPG on the highway.
Thanks
KO
I am working on my 700R4. The pan was still leaking after changing out yet another gasket so this time, I am changing the pan out as well. I had previously (years ago), installed a Complete Brake Switch Circuit for the lockup converter.
http://www.bowtieoverdrives.com/cata...php?ITEMID=332
Once I had the pan off I noticed that the 4-3 pressure sensor was still there but not hooked up to anything. The transmission was originally wired with a pressure sensor in both 4-3 and 4. As part of the kit, it had me replace the 4th gear pressure sensor. I can't find anything though that says what to do about the 4-3 pressure sensor.
Do I remove it and leave it open? (I don't think so, but I'm not sure)
Do I leave it in there? (Is it hurting anything?)
Do I remove it and plug it?
Original wiring:
New Wiring
I have not driven it very much yet, but I do not feel that it has ever gone into OD. I can only count 3 distinctive shifts while on the highway. I've been averaging 10 to 12 MPG on the highway.
Thanks
KO
#2
When I did my 700r4 I installed a normally open 4 th gear pressure switch with one terminal. Those tan wires are coming from the ground side of the tcc solenoid. I disconnected the 2nd and 3rd gear pressure switch wires and ran one ground wire from the ground side of the tcc solenoid to the 4 th gear pressure switch. This will provide lock up in 4th gear only. You will want to wire in a toggle switch to turn off 12v to the tcc so that you can choose whether you want 4th gear lock up or not. If you do not your trans will lock up immediately as soon as it shifts into 4th gear. I did not use a kit so am not sure what your kit is supposed to do. You can get the normally open 4th gear pressure switch at any gmail dealer or trans shop.
#3
Team Owner
Should there not also be a vacuum switch that can drop lockup when the throttle is depressed significantly? The lockup (L/U) clutch is not capable of handling high torque loads, and is usually programmed (ECU or hardware) to drop out under significant throttle.
There are L/U controllers that do all that 'decision making' to protect that clutch from being in compromising situations. I highly recommend them.
You can also put a toggle switch into the power to such a controller to turn it OFF whenever you want. [power thru the brake switch, thru the 'override' switch, to the controller, to the transmission]
There are L/U controllers that do all that 'decision making' to protect that clutch from being in compromising situations. I highly recommend them.
You can also put a toggle switch into the power to such a controller to turn it OFF whenever you want. [power thru the brake switch, thru the 'override' switch, to the controller, to the transmission]
#4
Race Director
Member Since: Apr 2007
Location: South Western Ontario
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If you apply power to the red wire at the connector then it should lockup in 4th gear. You could tell it's locked if you accelerate until it goes into 4th and then go on and off the throttle a bit because there will be no rpm change that you normally get due to converter slip. It'll behave the same as going on and off the throttle in a standard.
#5
Burning Brakes
Thread Starter
Thanks for the advice.
My concern right now is that extra pressure switch.
Do I remove it and leave it open? (I don't think so, but I'm not sure)
Do I leave it in there? Is it hurting anything?
Do I remove it and plug it?
New Wiring
Thanks,
KO
My concern right now is that extra pressure switch.
Do I remove it and leave it open? (I don't think so, but I'm not sure)
Do I leave it in there? Is it hurting anything?
Do I remove it and plug it?
New Wiring
Thanks,
KO