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Old 12-10-2001, 05:34 AM
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Post 700-R4 in a '57 chevy

I am going to install a 700-R4 in my 57 chevy and I need to know how I can hook up the electric clutch without a computer.

The trans is from an 86 Pontiac Firebird.

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Old 12-10-2001, 10:18 AM
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Genaral Motors used a vacume switch mounted on the firewall of some mid 80s trucks that ran lockup trannys and no computer, I have one of these units in the storeage see if it has a number on it. but you can still get them in a boneyard the one I have came from an 83 C10. They also are made by aftermarket companies, TCI makes one for around 80 bucks
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Old 12-11-2001, 12:37 PM
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There is also some type of hydraulic presure switch that is internal to the tranny that my tranny rebuilder put in the 700R4 I had built. I actually put mine in a 56 Chevy with a 3.73 rear end. Works Great!!! The local rebuilder built it for $700 but we don't race this car. If you are going for a 300HP plus motor or planning on running the car at the track, I would look into the B&M 700R4. They list them in Summit and Jegs catalogs. Seems like you have to be carefull also about how may splines the tranny has. The early 700's shafts broke easily if I remember right. You are definately looking into the right tranny!! They have a low first gear and the O/D is awesome!
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Old 12-11-2001, 01:01 PM
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the vacuum(non electrical) lockup setup is for a truck, mid 80's thru early 90's, with the 700r4 behind a diesel engine. you should be able to go to the dealer and ask for it, and last time i checked it was less than $40
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Old 12-12-2001, 06:12 PM
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Contact "PAINLESS WIRING", they are a company that manufactures fuse panels and other wiring components for street rods. They make a kit to allow the 700R4 torque converter to lock up in fourth gear via a firewall mounted vacuum switch and also a harness that wires into the brake light switch that unlocks the converter when you use the brakes. Ive used this kit for many years without a problem and it is not difficult to install.
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