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Old 12-16-2012, 04:26 PM
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700r4 tv plunge concern

Hi. Now this is my first 700r4 trans and I have done as much research as possible in regards to getting this thing setup right on a custom install. Dont want to burn up a fresh $1000 rebuild.

I cant seem to get my throttle valve to plunge fully into the valve body. It seems the throw in that plunger are maxes out where you see it in the first picture and that no adjustment at the carb or cable will cause it to go any further. It is hitting a stop.





The second picture is where it sits before operating the cable.

Does this look Ok? Anybody see anything that I might be missing? I had read a few places that that plunger should be fully in the valve body.

Thanks!

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Old 12-16-2012, 05:48 PM
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Well I think I found the problem and I see no way of correcting it short of buying another TV cable. My current cable which I paid a premium for made by T-otal C-rap I-ncorporated appears to have a shallow limiter in the transmission end of the sheath which the cable linkage and hook from the trans bottom out on 1/4" shy of full engagement. There is no way I can see to correct the problem other than replacing the cable or hacking up my plunger rid linkage which I do not want to do.

Here's what I'm talking about. That limiter in the sheath is inly 2.5" deep. I need 3" to fully engage throttle valve. We'll see what TCI has to say tomorrow.
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Old 12-17-2012, 04:00 AM
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So the Linkage Rod is hitting in the Cable sheath?
If the TV Cable is adjusted correctly and that is happening, this part would help >> http://www.sonnax.com/system/announcement/77872-01.pdf
Sonnax - Aftermarket replacement transmission, torque converter, and high performance automotive parts
Or a new TV Cable.


Bowtie Overdrives | TV Made EZ
SUBJECT: 700R4 Throttle Valve Cable Adjustments

Do you have the correct TV Cable bracketry?
What type/brand Carb or Throttle Body do you have?
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Old 12-17-2012, 08:51 AM
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If I remember correctly, I was thinking the end of the plunger should be flush when throttle is wide open.

Last edited by Adam65; 12-17-2012 at 08:57 AM.
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Old 12-17-2012, 02:54 PM
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Quote:
Originally Posted by SSedan64 View Post
So the Linkage Rod is hitting in the Cable sheath?
If the TV Cable is adjusted correctly and that is happening, this part would help >> http://www.sonnax.com/system/announcement/77872-01.pdf
Sonnax - Aftermarket replacement transmission, torque converter, and high performance automotive parts
Or a new TV Cable.


Bowtie Overdrives | TV Made EZ
SUBJECT: 700R4 Throttle Valve Cable Adjustments

Do you have the correct TV Cable bracketry?
What type/brand Carb or Throttle Body do you have?
It looks like that shortened TV link may solve the problem. I just wonder why the hell the cable is made this way causing the problem. And who's to say if I buy another cable it wont have the same problem. What a pain in the ***!

This is why it's best to open up the trans and visually check plunge when setting up a new TV cable. I could have burnt it up, because everything else checked out.

I'll do some calling around and see if I can't find an answer. Any other opinions are surely appreciated. Thanks!
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Old 12-17-2012, 04:59 PM
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Quote:
Originally Posted by SSedan64 View Post

Do you have the correct TV Cable bracketry?
What type/brand Carb or Throttle Body do you have?
I have an edelbrock carb with edelbrock bracket, but none of this can have an effect or a change on my problem. It's basic mechanics. TV link and cable bell need to travel anout 2 3/4" towards carb to fully engage plunger, but with this cable there is a limiter at 2.5" not allowing it to travel as far as it needs to.

Does anyone have specs on that sonnax TV link rod. The one in my trans is 3.4" long. If the sonnax one is 3" or less it should work for me.
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Old 12-19-2012, 09:40 AM
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I don't know the short TV Link specs, Sonnax may be able to tell you.

Do you have the TV geometry corrector Bracket for your Edelbrock carb?
Summit Racing® Throttle Valve Correctors SUM-700203 - SummitRacing.com
This corrects cable pull & Line pressure rise.
Mounted Pic >> http://transmissioncenter.net/Setup.jpg
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Old 12-19-2012, 11:48 AM
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Yes I have the corrector. Nothing on the carb end will change the limitations of the trans end cable sheath internal stop. I called up tech support at bowtie overdrives yesterday and had them take some specs from thier off the shelf TV cables and what we found was that in fact the TCI unit limits the amount of cable travel on the trans end causing it to bind. The distance from end of cable to internal limiter on the TCI is 2 1/2", and about 1/4" too shallow for wide open throttle with the stock TV link. Bowtie OD's measured one of their universals and it has a 2 7/8" measurement to internal stop. The factory GM unit has 3 1/4" to internal stop. So you're results may vary but the measurements don't lie. I even called TCI and had them measure another one of their units and it was the same as mine which rules out a mfg defect in the one I have. My advice is to stay away from the TCI cable. If you are not able to drop the pan or check line pressure a person would never know what was happening.
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Old 12-21-2012, 06:00 AM
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I wonder what brand the TCI cable is, I'm sure it's just a rebranded/repackaged cable?
Good Info to know to stay away tho'.
I haven't had much luck with anything I've used from TCI.
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