Turbo 400 kickdown circuit connector questions - Hot Rod Forum : Hotrodders Bulletin Board
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Old 10-26-2019, 07:45 PM
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Turbo 400 kickdown circuit connector questions

1) My 37 Ford streetrod has a 350 sbc with a Turbo 400 that my PO never hooked the kickdown circuitry up on. I see numerous articles referring to a single spade connector on the trans but my trans connection has 2 spades, a horizontal at the top & a verticle down the center. I have seen posts suggesting to ignore all but the verticle spade. I have read other posts alluding to emission controls (timing retard?) so I am seeking direction/advice from others that have travelled this road before. Should I just be concerned with the verticle spade??

2) Does anyone know of a simple bracket and/or switch assembly either at the intake manifold / carb (Holley?) or accelerator pedal to get 12v to the trans case connector? Is the B&M #20297 the only game in town. What's the hot ticket here??

Thanks in advance!!

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Old 10-26-2019, 09:18 PM
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There is Cascade Transmissions, Sonnax, Oregon Performance, several others.

The B&M is common, but of course you can make your own if your good with basic fabrication.

Tucson has Don's Hot Rod Shop... In business 40+ Years... See what you have in local area and ask what they have, maybe they experienced a specific one they recommend.

Lokar Has a cable driven unit with the box that mounts to the pan rail.
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Old 10-27-2019, 08:33 AM
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You can take a wire with 12 volts and touch it to each terminal and see which one makes a clicking sound inside the transmission. It's a little solenoid you should hear. I made my bracket but it's far from beautiful. It mounts on a intake manifold bolt and takes a twist and turn up to the carb so it actuates a "micro switch" (snap action) switch just a little before WOT.
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Old 10-27-2019, 08:46 AM
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The vertical spade is for the kickdown.
https://www.hotrodders.com/forum/wha...do-522985.html
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Old 10-27-2019, 09:28 AM
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The two terminal connectors were used on early 1970s TH400s. As others have pointed out, the vertical leg of the "T" is for the kickdown solenoid. The crossbar of the "T" is connected to a high gear pressure switch that was part of the transmission controlled spark emissions system. TCS was intended to disable distributor vacuum advance in lower gears to reduce NOx emissions. The need for TCS went away when EGR was mandated for the 1973 model year, so this is likely a 1970-72 transmission. Ignore the crossbar terminal and simply connect the kickdown wire to the vertical terminal.
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Old 10-28-2019, 06:06 PM
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Quote:
Originally Posted by 55 Tony View Post
You can take a wire with 12 volts and touch it to each terminal and see which one makes a clicking sound inside the transmission. It's a little solenoid you should hear. I made my bracket but it's far from beautiful. It mounts on a intake manifold bolt and takes a twist and turn up to the carb so it actuates a "micro switch" (snap action) switch just a little before WOT.
I'm not concerned with pretty. I'd like very much to fab my own, would you share info on micro switch ID & bracket details? Thanks for your help!!
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Old 10-28-2019, 08:41 PM
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Quote:
Originally Posted by Les-10 View Post
I'm not concerned with pretty. I'd like very much to fab my own, would you share info on micro switch ID & bracket details? Thanks for your help!!

Here 2 pics. I don't know the part number of the switch,sorry. I would suggest making the bracket longer so the switch is higher and the length of the lever doesn't have to be as long. It doesn't get much simpler than this.
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Old 10-29-2019, 12:39 AM
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Picture ... worth a thousand words

Ahhh, sweet & simple. I was thinking along the lines of springs, etc. Thanks again!!!
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Old 10-29-2019, 08:32 AM
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You are quite welcome. If you modify/improve on it you have to show me!
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Old 10-29-2019, 09:10 AM
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You can get a similar pre-fabbed set-up from Nitrous Oxide Systems and other nitrous companies, under the heading of "WOT nitrous activation switch". Comes with the switch, some wiring and terminals, and a bracket that bolts on at a carb mounting stud or to the carb main body, depending on the style..

https://www.holley.com/products/nitr...parts/15640NOS
https://www.holley.com/products/nitr...parts/600-1QFT
https://www.holley.com/products/nitr...parts/16512NOS
https://www.holley.com/products/nitr...parts/16513NOS
https://www.holley.com/products/nitr...parts/15641NOS
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Old 10-29-2019, 09:50 AM
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Yes to the pre fabbed ones, but I kept switching from a Holley to a Q-Jet and with and without a spacer, and even with two spacers. So it had to be versatile.
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Old 10-29-2019, 11:37 AM
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I just bought a nitrous micro switch that was spec'd for my carb. Inexpensive, simple and works.Click image for larger version

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Sent from my SM-G950U using Tapatalk
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Old 10-29-2019, 11:55 PM
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That's slick!
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Old 10-30-2019, 07:11 AM
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I just bought a nitrous micro switch that was spec'd for my carb. Inexpensive, simple and works.Attachment 449193

Sent from my SM-G950U using Tapatalk

That nice if I could decide what carb I'm going to keep on this car.
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