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Old 06-24-2010, 02:41 PM
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700r4 , lockup converter electrical questions

I am swapping from a TH350 to a 700r4 and have read most of the 700r4 tech I could possibly read. My driveshaft snapped in half and destroyed the TH350 bellhousing and a section of my flooring. Lesson learned...use a driveshaft safety loop.

The 700r4 I have is from 1985 and does not have the auxiliary valve body. I have spent 850$ in getting it fully rebuilt. I wanted to keep the lockup and this trans was owned by 2 different guys prior to me getting it. Here are the parts in it:

-Full rebuild kit (3-4 gear uses 6 clutches)
-Kevlar band
-13 vein pump
-Corvette Servo
-New lockup solenoid
-New Reverse input drum
-"Beast" Sunshell
-.500 input boost valve with larger output valve
-Transgo shift kit
-New TV cable

My question is dealing with the wiring itself. I was reading installation instructions for the painless wiring kit (http://www.painlesswiring.com/Manuals/60109.pdf). What confuses me is that I don't have the 4th gear pressure switch or any wiring by the servo. The only wiring I have in the pan is going from the lockup solenoid to the factory plug.

So is the 4th gear pressure switch necessary? Am I missing anything, as far as you can see by the pics, that is a necessity for the electrical system that is paramount to operating this transmission? Is it possible to put in an auxiliary valve body and are there any benefits or will I be fine with what I have?

My plan was to route the 12v source wire from the transmission up to the brake pedal then to the toggle switch. But looking at painless wiring, there is a vacuum operated switch as well which threw a wrench into my thought process.

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Old 06-25-2010, 08:47 PM
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not sure this helps,

the pressure switch commonly used is a N-Open self grounding switch. Ground wire from solenoid is wired to switch. lock up of the converter in 4th gear only when switch is located in v-body hole near acculilator .

your method of wire you can control lockup in most gears as desired.

I never see a need for vacuum switch in the hook ups. Wire through brake lite switch is fine... a common brake lite switch with dual poles for crusie control works well
Dont worry how old you are... it is the mileage on your body that adds up.
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