I wanted to get a top speed out of my car and not have my transmission downshifting at WOT in 4th gear. So i disconnected the kickdown cable so when i was in fourth gear i could use WOT. But driving it to the interstate i noticed that my shifts were nice and firm. I had almost full control over my shifts and the whole nine yards. I put it back on later b/c i didnt know if it was bad for it or not but im optimistic and didnt want to take a chance. Anyone now the disadvantages of this? 91' GTA LB9 700R4

 

I don't know how you had any control over your shifts. the cable regulates when your car shifts. your lucky your's has the chck ball at the bottom of your throttole valve or your tranny would be toast.

 

Yes, a dead 700R4!

 

Whats the check ball? My trans has always been different than everyone else b/c i could be going 50 down the highway and if i shifted it into first it would go no matter what.(NO i dont do that)Plus if i left it in first and punched it, it wouldnt shift unless i shifted it into second(And NO i dont do that either) But its always been strong and has had firm shifts. And yeah i did have FULL control upshifting and downshifting with the cable off. Why, i dont know maybe you can answer that.

 

Are you sure it is a 700r4? the chck valve is at the bottom of your throttle valve to ensure that it stays a least partially open lets the oil thru in other words. i have never tried it with a 700 but i know that a 400 and 350 will shift back and forth from 1st to 2nd say if you dropped it in 2nd.

 

my 700r4 will do all the things listed above and i'm also trying to find a way to be able to run in 4th at WOT

 

a 700r4 wont shift without a detent the detent is everything my detent broke and i lost everything if your shifting without a detent you got a rare 700r itll shift without the computer so when your walking remeber a few of us warned you



just my .02

 

Main thing to remember is a 700 is a lot different than the 350/400s... It's not necessary to run a kickdown cable on them if it's a strip car... the 700r4s use the kickdown cable (detect) to boost the fluid pressure in the transmission.

So, running without a detect on a 700r4 is pretty bad.

I had Probuilt fix up my new S/S 700r4 (spring '02) so it wouldn't Downshift out of OD at full throttle. :-)

I can now run 100% throttle in OD without a downshift... if I wanna downshift I just tap the gas to raise pressure in the transmission and then I pull the shifter back into Drive.

The transmission still functions normally though... it will downshift as I slow down just not at WOT.

 

If I remember what I read correctly, its a simple $10 or $15 part that will allow the 700r4 to stay in 4th @ WOT.

Still available me thinks. And, no TV cable on a 700r4 means a dead 700r4 in very short order.

 

i didn't mean that i had run mine without the tv cable. i don't wanna try that. hey, if you can give me anymore info on the $10-$15 part, i would really appreciate it.

 

Actually the part I think your referring to is the GM part number for the WOT upshift into OD. It was part of the police package, It's a simple plunger and sleeve that go into the Valve Body.

Still downshifts at 80% throttle or so. (I believe)

If you really want to know why don't you just call Pro-Built... I'm sure he could tell you how to do it and maybe hook you up with the parts.

Pro-Built Automatics
934 5th Street
Calimesa,CA. 92320
800 776 3288

 

your going to cook you tranny if you disconnect that cable trust me. I did what your planning and cook my tranny with only 30k on it .my tranny guy told me that was the reason!! it controls tranny fluid pressure. i just installed that police package 3-4 upshift valve on monday GM part # 8673948...$ 19.66. i took the car to 4th at WOT and it still didnt shift. I see from a statement above that this will hold 4th gear at 80% but i havent tried that yet

 

does your car have cruise control? that cable looks like the old "detent cable"

 

yes i have cruise its just not hooked up

 

All I have to say about disconnecting your throttle valve cable is:

BAD THINGS....

Things like that exist for a reason, without it, you won't be running enough line pressure at WOT to hold the clutches.. If you want to something silly, at least just force the throttle valve to MAX... That would make for some interesting garage shifts..

 

all the way forward is max right?


im having hell with mine it start sliping at 4500

 

The cable slides in and out of a housing (which goes into a throttle bracket, holding it stationary)... If you push the cable "into" the housing (towards the firewall), you are increasing line pressure (well, once the valve starts its management, it will be open more in relation to throttle position)...

 

Yeah, all the way forward is max. It's not good to manually adjust the TV cable though. To much pressure can kill the trans quickly too.

Matt

 

"All of the way forward" is confusing... When I think of forward, I think of "towards the front of the car", which would be the wrong direction...

 

sorry, when I wrote I was thinking of my standing position as in front of the car looking towards the rear

 

My 88 Formula is bone stock and it upshifts to 4th at WOT.
I ran my friend the other night in his 88 GTA 305 5 speed and I was ahead of him till I shut down at 130mph. It surprised me since 4th gear was slipping bad a few weeks ago, I'd smell a burning clutch smell if I kept it in WOT in 4th too long.

 

A guy I work with told me that all the TV cable did was "kickdown" the trans to a lower speed when you mash on the accelerator. So I didn't even connect when I hooked the other stuff up. I drove it a little and noticed it would not shift hardly at all, until the rmps were very high, then it shifted hard into second. Well this scared me so I went back home slowly in first gear. Since then I discovered that its not just a kickdown cable on these cars, it sets the shiftt points based on throttle position. I never could get it adjusted right with the Lokar cable, so I took it back off and put on the stock one after driving it for a few weeks. I talked to a performance shop guy and he told me he put in a 700r4 once, forgot to hook up the TV cable, test drove it to the corner and fried the tranny. My transmission is now toast, wont shift into 3rd at WOT, have to let off the gas. This isn't to good for drag racing obviously, (haha) and im sure the tranny will go completely soon. I am positive that I damaged something enough to ruin the transmission after a few drag races.
Im goint to put in a TH350 or 400. The way I understand it, these trannys are like my friend said, the cable is just a kickdown cable.

I wouldn't recommend messing with your tv cable unless you want a good excuse to get a new transmission

 

A poorly adjusted TV cable can make your tranny feel like its slipping BIG time.

The best method I have found for adjusting them is the TGO faq. While the engine is off, depress the button on the TV cable assembly and pull the outer casing of the TV cable all the way back to the firewall.

Then, get in the car, and mash the pedal all the way to the floor. Perfect adjustment every time.

Start engine, go for a drive and enjoy.

 

This thread is kind of back from the dead, but what the heck.

The TV cable on the 700R4 combines the functions of the kickdown cable (or switch) and vacuum modulator on the older transmissions.

 

as far as i can tell they all EVENTUALLY upshift to 4th.

you floor it, it kicks down into the lowest gear it can... say, 2nd...

then it shifts into 3rd... and then you just have to be going fast enough that it shifts into 4th.

i know my 82 with a stock 87 700R4 could do it...... i donno about my 91 since i still have a 114ish speedlimiter.

 

I had to always let up for the 4th gear shift. And if I couldn't go over 50% throttle or so or it would downshift out.

I can get WOT shifts and go 100% in OD now with my new probuilt like I stated before.

 

I do not have the TV cable hooked up in my car. I was tired of how the car shifted by itself, it was always too early,and slow. So I went with a full manual valve body. It shifts when I say, it will not shift by itself. With a stall converter this setup its very enjoyable to drive

 

please tell me that you do have a real manual valve body and are not just calling it that because you can manually shift with the tv cable unhooked....

 

Of course I have the manaul valve body. What do I look like a Ford boy?

 

lol.....just wanted to make sure