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Author Topic: 400 turbo kickdown switch _ Where is is located - how to hook up  (Read 3868 times)
fixitrht
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Posts: 1782


« on: August 12, 2012, 07:40:40 PM »

Im transplanting my 400 turbo and 455 into my 80. The 71 contained the 455 and I would like to know where the mech that control the trans. Thanks for any
 help!
« Last Edit: August 16, 2012, 09:30:59 AM by fixitrht » Logged


My cars
77 400 4 SPEED W72 Y81 SE (Driver)
79 Y84 Auto SE non t-top (Collecting Parts)
71 400 4 SPEED FORMULA (Working Restoration)
73 455 4 SPEED TA Brewster (Waiting Restoration)
79 403 (not sure why I got this)
80 455 (daily)
cant talk about the 3 parts cars..
75 Chevy Corvette-- not by choice
firebirdparts
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Posts: 14365



firebirdparts
« Reply #1 on: August 12, 2012, 09:46:01 PM »

Above the gas pedal.
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I want to be like Paul Kenny when I grow up
Joe Bays
fixitrht
Oracle Forum Member
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Posts: 1782


« Reply #2 on: August 13, 2012, 07:13:50 AM »

ah, there she is...
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My cars
77 400 4 SPEED W72 Y81 SE (Driver)
79 Y84 Auto SE non t-top (Collecting Parts)
71 400 4 SPEED FORMULA (Working Restoration)
73 455 4 SPEED TA Brewster (Waiting Restoration)
79 403 (not sure why I got this)
80 455 (daily)
cant talk about the 3 parts cars..
75 Chevy Corvette-- not by choice
fixitrht
Oracle Forum Member
*
Posts: 1782


« Reply #3 on: August 16, 2012, 09:30:36 AM »

Ok, there are two wires in and out of the switch and trans.
The current plug goes into the original harness which I would not was to cut and it is uncut today. Thes question now becomes how do I use the 71 switch ? Perhaps a wire diagram. Assuming I need 12 volts from the fuse box in one side of the switch and the other side to the trans, The question is really which lead in the trans get the switch hot? and what to do with the other lead on the trans?
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My cars
77 400 4 SPEED W72 Y81 SE (Driver)
79 Y84 Auto SE non t-top (Collecting Parts)
71 400 4 SPEED FORMULA (Working Restoration)
73 455 4 SPEED TA Brewster (Waiting Restoration)
79 403 (not sure why I got this)
80 455 (daily)
cant talk about the 3 parts cars..
75 Chevy Corvette-- not by choice
firebirdparts
Jedi Council
Oracle Forum Member
*
Posts: 14365



firebirdparts
« Reply #4 on: August 16, 2012, 09:45:19 AM »

Power to the switch, and one wire from the switch to one prong on the transmission.  One connection on the trans would be unused, maybe.  I was told, 30 years ago, that the two-wire pontiac transmissions had a wire going to a switch-pitch converter.  If that's true, it's not directly related to kickdown, but I am not sure just when it got turned on.

You may want to investigate whether you want to use that feature.
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I want to be like Paul Kenny when I grow up
Joe Bays
firebirdparts
Jedi Council
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Posts: 14365



firebirdparts
« Reply #5 on: August 16, 2012, 09:49:35 AM »

Well, here's another option:

According to http://www.442.com/oldsfaq/oftsp.htm,
'Now, trans made/used outside of 1965-1967 might have two terminals, one for the kickdown, and one for the TCS solenoid (prevents vacuum advance except in high gear). The TCS is wired to a pressure switch connected to the accumulator piston area" 

Presumably, this pressure switch would go to ground in 3rd gear, or perhaps when you're NOT in 3rd gear.  I have never heard of this feature before.
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I want to be like Paul Kenny when I grow up
Joe Bays
fixitrht
Oracle Forum Member
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Posts: 1782


« Reply #6 on: August 16, 2012, 12:12:48 PM »


"Now, trans made/used outside of 1965-1967 might have two terminals, one for the kickdown, and one for the TCS solenoid (prevents vacuum advance except in high gear). The TCS is wired to a pressure switch connected to the accumulator piston area, that allows full vacuum to the distributor only when the car is in third gear when the engine is cold. There probably is two wires coming from the thermostatic vacuum switch on the front of the manifold. "

So Im not sure I need all of the TCS function.. I do remember something about a new switch to replace the 2 pin connector with a 1 pin working just the kickdown?? I will see if I can find something
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My cars
77 400 4 SPEED W72 Y81 SE (Driver)
79 Y84 Auto SE non t-top (Collecting Parts)
71 400 4 SPEED FORMULA (Working Restoration)
73 455 4 SPEED TA Brewster (Waiting Restoration)
79 403 (not sure why I got this)
80 455 (daily)
cant talk about the 3 parts cars..
75 Chevy Corvette-- not by choice
firebirdparts
Jedi Council
Oracle Forum Member
*
Posts: 14365



firebirdparts
« Reply #7 on: August 16, 2012, 12:19:50 PM »

If you have a connector that fits, just wire up one wire and ignore the other.
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I want to be like Paul Kenny when I grow up
Joe Bays
fixitrht
Oracle Forum Member
*
Posts: 1782


« Reply #8 on: August 16, 2012, 12:24:25 PM »

aggree, just tring to figure out which one , ill find a pick
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My cars
77 400 4 SPEED W72 Y81 SE (Driver)
79 Y84 Auto SE non t-top (Collecting Parts)
71 400 4 SPEED FORMULA (Working Restoration)
73 455 4 SPEED TA Brewster (Waiting Restoration)
79 403 (not sure why I got this)
80 455 (daily)
cant talk about the 3 parts cars..
75 Chevy Corvette-- not by choice
fixitrht
Oracle Forum Member
*
Posts: 1782


« Reply #9 on: August 16, 2012, 12:30:58 PM »

states orange wire.... Ill try to find a pic, but will verify with the original harness
Logged


My cars
77 400 4 SPEED W72 Y81 SE (Driver)
79 Y84 Auto SE non t-top (Collecting Parts)
71 400 4 SPEED FORMULA (Working Restoration)
73 455 4 SPEED TA Brewster (Waiting Restoration)
79 403 (not sure why I got this)
80 455 (daily)
cant talk about the 3 parts cars..
75 Chevy Corvette-- not by choice
fixitrht
Oracle Forum Member
*
Posts: 1782


« Reply #10 on: August 16, 2012, 12:39:19 PM »

 post from another site-- Ill give this a try

"I have a TH400 in my 69 C-10. Recently I learned the transmission requires the kickdown detent circuit be hooked up, which it isn't.

Also I just read that not having it hooked up will accelerate wear on the clutches (FYI to anyone out there with a TH400), and may cause it to up-shift prematurely (which mine does) so I'll be hooking mine up ASAP.

It'll require the install of a kickdown switch (stock item on older cars, but mine never had one) which I'm getting Monday ($45 B&M Kit includes switch, spring, attachment parts, etc for mounting near the carb).

What I also learned is that my particular trans has two spade terminals sticking out where most TH400's only have one. They are arranged in the shape of a "T".

Apparently, the vertical part of the "T" is where the pos 12 volt connects (that comes in from the key-on side of the dash, then via the kickdown switch) to the kickdown detent solenoid inside the trans.

The second terminal (Horizontal bar/top of the "T") apparently grounds the TCS switch (which isn't there any more) when the trans is in 3rd gear.

Confusing things some, the double connector on some 65-67 B.O.P.C.s could be an indicator of a "switch pitch" stall speed torque converter option. Am pretty sure I don't have this because I think I have a Chevy TH400 transmission.

"
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My cars
77 400 4 SPEED W72 Y81 SE (Driver)
79 Y84 Auto SE non t-top (Collecting Parts)
71 400 4 SPEED FORMULA (Working Restoration)
73 455 4 SPEED TA Brewster (Waiting Restoration)
79 403 (not sure why I got this)
80 455 (daily)
cant talk about the 3 parts cars..
75 Chevy Corvette-- not by choice
Ben
Oracle Forum Member
*
Posts: 1955



« Reply #11 on: August 16, 2012, 05:52:09 PM »

Also I just read that not having it hooked up will accelerate wear on the clutches (FYI to anyone out there with a TH400), and may cause it to up-shift prematurely (which mine does) so I'll be hooking mine up ASAP.
Shifting during normal driving is controlled by the vacuum modulator connected to manifold vacuum.  Firmness of shifts is controlled by springs in the valve body.  You don't need the kickdown hooked up at all for the transmission to function correctly, as the only time the kickdown gets engaged is when you open the throttle to 3/4 or more.

Does it look like this:



?

That's a switch pitch connector, which I believe was mostly a Buick item.  Not many cars came with them and they are pretty sought after in some circles because of the 2 different stall speeds.
« Last Edit: August 16, 2012, 05:55:28 PM by Ben » Logged

Trans Am-less at the moment...

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