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Old 07-23-2008, 06:53 PM
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700r4 lock or unlock t converter

I have a 700r4 out of a 85 full size chev auto

what do I need to elec lock or un lock the converter
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Old 07-24-2008, 01:56 AM
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Quote:
Originally Posted by JDS539
I have a 700r4 out of a 85 full size chev auto

what do I need to elec lock or un lock the converter
You can just run 12Volts to Pin A on the side connector through a toggle switch if your the only one driving the vehicle. This will work for 4th gear highway/freeway cruising with lockup. Just don't froget to trun it off before you try to a stop. If you want it to unlock/lock automatically you'll need to run the power through a vacuum & brake switch like this in link below. You can get these parts from the junkyard from early 80's cars/trucks that came with TH350C trans or buy them new.
http://www.tciauto.com/Products/Inst...76600_inst.htm

Look here for more Info too about 7 pages>
http://purplesagetradingpost.com/sum...o/700R4p1.html
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Old 07-24-2008, 06:48 AM
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700r lock up

is there a kit that I can buy to unlock the torque converter that does not require me to open up , remove the pan, I see in the catalogs that one is sold that fits into the brake system- this 700r4 came out of a carb car- all the kits I see talk about a computer- and if I am correct this car did not use a computer to run the trans- this streetrod I am building is a 'driver" w/ only a 250 hp sb eng- I just want to drive it 70 mph on the freeway and not have a manual switch to unlock the trans- my wife will want to drive it and u know how that will go
thanks
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Old 07-24-2008, 09:35 PM
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Quote:
Originally Posted by JDS539
is there a kit that I can buy to unlock the torque converter that does not require me to open up , remove the pan, I see in the catalogs that one is sold that fits into the brake system- this 700r4 came out of a carb car- all the kits I see talk about a computer- and if I am correct this car did not use a computer to run the trans- this streetrod I am building is a 'driver" w/ only a 250 hp sb eng- I just want to drive it 70 mph on the freeway and not have a manual switch to unlock the trans- my wife will want to drive it and u know how that will go
thanks
There are kits that have instructions to lock/unlock the converter externally using the 4th gear pressure port on the passenger side of the trans. I think some just use the brake light switch to disengage lockup. Doing it this way, when the trans shifts to 4th it sends pressure to the passenger side port with the added pressure switch which sends a signal to Pin A on the driverside electrical plug and engages/disengages the TCC/TorqueConvertorClutch. hen the trans downshifts out of 4th it will also cut the signal and disengage the TCC. Here's 1 link to a cheap kit but it doesn't include a vacuum switch.
http://cgi.ebay.com/ebaymotors/700-R...QQcmdZViewItem

With this kit you just add/use your own wire. Very simple & cheap. Only locks the TCC in 4th gear. If it doesn't work when connected you'll need to get a 2 wire N.O./NormallyOpen TC solenoid. The TC solenoid does mount inside the trans pan in the bottom right side of the pump.
http://www.bulkpart.com/Merchant2/me...200-4Rsolenoid
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