Matt S iroc

i just gotta rs and was wondering if u can adjust the shift points like u can on the irocs with the passing gear cable there by the throttle body.i havent checked it out just figured id ask!also anyone know what the best fluid is to use in ur trainny?

camaronewbie

There is no adjustment in the shift points with any cable, whether IROC, RS, or any 'Bird car of the 3rd generation. The 700R4 has a TV Cable (Throttle Valve Cable) - it is adjustable, but the purpose of the adjustment is to make sure the transmission is shifting where IT needs to, not where YOU want it to.

These are NOT the "kickdown" cables of the old days! It's imperative that the transmission shift at the points it needs, any malfunction of the TV cable or wrong adjustment of it will result in serious damage to the transmission requiring a rebuild. Many folks here have found out the hard way, totaly destroying a fresh built 700R4 within several blocks even - all from a wrongfully adjusted TV cable.

Here's a link to properly adjust the TV cable:

https://www.thirdgen.org/detent

Matt S iroc

yeah,sorry but u are wrong!there is a cable u can adjust that u can set it to shift at different rpm.and its right by the throttle body on the irocs.i know this because i adjusted mine when i had my 87 iroc!yes it was a 700r as well and it just so happens to b the passing gear cable.if its adjustable it will have a plastic tab that u can click to release the cable,u pull the cable till it clicks and your set up.you couldnt feel the shift until i adjusted mine,i set it to shift at 2000 rpm and it had the firm shift that i like.i think only the tpi has the set up cause my rs doesnt have it its just a regular cable.if u have a tpi check it out.

gurkgurkgurk

camaronewbie is right. that cable has an adjustment only to accommodate for wear and other circumstances. its not adjustable so u can have it shift wherever you want. play with that cables adjustment enough and i guarantee you that youll fry your 700r4. simply follow the service procedure for adjusting it and let it be. although i have seen a shift improver spring that you can put on the end of the cable, and i currently have it on my Iroc, and it doesnt change the shift points, but simply gives you that firm shift that alot of people like.

duckmanquacker

I also will back up camaronewbie, and you had better start doing proper research before you decide to attack the senior members of this forum we are here to assist you not feed you a bunch of bull.

camaronewbie

Any car that has the 700R4 will have that adjustable cable. Whether it be an Iroc, an RS, a Caprice - whether TPI, TBI, carbed doesn't matter - every 700R4 has that. But I'm telling you, the adjustment is not for YOUR preference, it's for the transmission's preference, and proper adjustment is critical.

But hey - set the cable where you like, it's your tranny - I just don't have the extra $1k laying around for a rebuild myself. If you want firmer shifts, get a shift kit, that's what they are for. Install 'vette servos, bigger boost valves, etc. But adjusting the TV cable to change shift points is a no-no. Maybe you'll get lucky, maybe it won't fry - I wouldn't bet my tranny on it though - I don't like walkiing

1989GTATransAm

iTrader: (3)

The way to change the wot shifts points is to play with the weights and springs of the governor.

texascat2

I don't have $1k either! I looked at the thread you directed us to. Is there a certain number of clicks? The last one I tried was an 88 TBI Suburban, I've slept since then! I just finished the install of new injectors. It now idles and runs smoother than it ever has (FIC's 22#ers). But now it won't downshift. Is the procedere the same as the 2.8l in the picture?
Thanks guys!

camaronewbie

Procedure the same on any 700R4

https://www.thirdgen.org/detent

texascat2

Thank you! That was quick!

texascat2

Ok, I'm trying to get the slider loose doesn't seem to want to move. I've pushed in the metal re-adjustment tab and can't get the slider to move one way or another. I'm slow and need better pictures, I'm sure I'm doing something wrong. Any suggestions?
Thanks

camaronewbie

Are you pushing the D-shaped thing in the hole? You have to push it hard - feels like your finger will break, hurts like hell, but just push it really hard, and you'll be able to move the slider towards the firewall. Then twist throttle all the way as far as the linkage will allow, this pulls the slider back out and it 'clicks' into place as it's sliding.

texascat2

I pushed it so many times I got a small c-clamp out. Here's picture, mine is not D-shaped like all the pics I looked at today.
https://www.thirdgen.org/forums/atta...1&d=1278978935

I couldn't make it move at all. Tried to drive it a short distance, it wouldn't come out of first.

1989GTATransAm

iTrader: (3)

Are you opening the throttle all the way after depressing the release button?

texascat2

Here's another picture.


The tab is square.

texascat2

I've tried it both ways.
Ok, just tried it again. Depressed the button and held it depressed, WOT, released the button, closed the throttle. Right?

texascat2

I guess I'm too dumb to figure this out. New cable maybe?

Fire"Dutch"Bird

iTrader: (1)

[QUOTE=gurkgurkgurk; although i have seen a shift improver spring that you can put on the end of the cable, and i currently have it on my Iroc, and it doesn't change the shift points, but simply gives you that firm shift that alot of people like.[/QUOTE]

I used to have that spring on my TV cable end as well, but shifting is so firm, I don't think the transmission will last....
So I removed the spring today, back to stock setting....!
What are your experiences with the spring, and how did you adjust the TV cable with it?

gurkgurkgurk

adjust the tv cable like normal. than add an extra click. otherwise itll shift ridiculously hard. the hard shifts are nice. theyre better on the tranny since less slipping occurs between gears. but its bad on everything else in the driveline, mounts specifically.

Drew

iTrader: (58)

-deleted

Fire"Dutch"Bird

iTrader: (1)

Which way, loose or tight?

Pro Built Automatics

Playing with the TV cable will change "part throttle" shift points and make it slightly smoother or frimer, BUT that is not the way to do this. The TV cable should be tight at WOT (TV plunger in the valve body fully depressed). This will give you maximum line pressure at WOT. It also should give you the best "downshift". The TV cable corrector from Sonnax is to make the part thottle shifts later and slightly firmer without pulling the TV cable out of adjustment at WOT. Sometimes this is necessary. To change the WOT shift to a higher rpm "in all gears" requires changing the governor weights and the 1-2, 2-3, & 3-4 shift valves and the springs that are with the valves from a valve body that has the shift points you want. Changing the governor weights only will change the WOT shifts points some, but it will change the 1-2 the most, 2-3 less, and 3-4 even less yet.

Fire"Dutch"Bird

iTrader: (1)

I found it a LOT firmer...??
Even shifting from P in D was not nice....!

Fire"Dutch"Bird

iTrader: (1)

Why is it necessery sometimes?

Fire"Dutch"Bird

iTrader: (1)

The movie uses a different way to adjust....???
Which way is best..?

Pro Built Automatics

Fire"Dutch"Bird, did you already have a valve body kit in it of some sort? The reason that it is needed sometimes is that when you make a camshaft change, the shifts are a little early for that camshafts lack of low end torque, or a rear end gear ratio change, or you want it to stay in each gear longer. Before doing that, you might want to remove the governor and take out the lighter of the two springs. This will make the part throttle shifts a little later, but mainly the 1-2 and 2-3 somewhat. But if you want all three shifts at part throttle later then the Sonnax TV cable corrector is the way to go here.

Fire"Dutch"Bird

iTrader: (1)

NO, my trans is stock, I have removed the Sonnax spring because the car was shifting way to firm (for my likeness anyway).
But now I noticed so many different ways to adjust the stock cable....??
F.i. by pressing the "D" button, you can slide the cable towards the firewall, but also the outerhousing can be moved up and down...
I have read ways by pulling the cable after pressing "D" and I have read ways by making the "snout" flush with the housing, and on both ways, at WOT you hear a series of "clicks" by the housing and/or the cable.....???

texascat2

I had major problems trying to get mine to adjust! I took it to a friend of mine on the car hauler so I wouldn't mess the tranny up. I don't know how he adjusted it, I had to leave. After he got it adjusted he recommended flushing the tranny and cooler. It now shifts like new! I watched so many videos and YouTube posts I thought I was loosing my mind!

Drew

iTrader: (58)

-deleted

TwinTurboROC

half way there, some are hard to adjust. once you press the square/D button in(hold it as your doing the next part), you have to push the cable to towards the back of the car, not the silver wire/cable, the black nipple(the cable comes out of it) right in front of the square button, once its back release the square, go WOT with the car off, youll hear it click a few times...done

as for "pre-loading" the tv, dont it'll seem better but youll burn your tranny, it wont recieve correct line pressure...its basicly a TPS for the tranny

Fire"Dutch"Bird

iTrader: (1)

Well, I removed the Sonnax spring, adjusted the TV cable to normal specs, and car shifts fine again...!!
Now all I have to do is solve my MAF sensor problems......!!

jo88gta

Wondering if anyone has any advice for this situation. My 700R4 was rebuilt by a local performance shop and overall I am happy with it. But, I believe my 3.70 gears mess with the shift points (significantly). WOT it is a monster, perfect shift points and STRONG through all gears shifts. The problem is when driving normal, it shifts way to quickly. Slowly leaving a stop light and accelerating gradually it will shift 1-2 at around 4mph, 2-3 at around 10mph and so on. The TV cable is so tight it seems like something can break or that it has to be stretching.

If I click out the adjustment by one click increments and check the cable for any play at WOT, it stays real tight (no play) until the 4th click. I am concerned that for some reason, when using the prescribed technique for adjustment, it is still to tight. Faulty cable adjustment mechanism or stretched cable? I am ordering a new TB since the current one is showing signs of throttle shaft wear. I am concerned that the TV cable being so tight attributed to the wear or the play in the shaft stops the cable from being pulled as far is it should?

Any comments on this would be appreciated.

Pro Built Automatics

If you add the Sonnax Sonnax TV cable corrector, part throttle shifts will happen later and the WOT shift points will not change. This is what you need here to solve this.

jo88gta

You the man! Thanks!