i have a 1989 gmc truck with a 350 and a 700r behind it i recently swapped the motor and never hooked the kickdown cable back up. someone recently told me that this would damage the tranny. i hooked it back up and it revs out real high in all the gears and i have to let off for it to shift. i was wondering what damage this could have done because i drove it this way for abouta month. if anyone knows ple****sseeee inform me. thanx.

Your Cable Probably Needs Adjusting . Maybe Better To Let The Garage Do It.there Is A Thread Some Where On This Site Or Club Hotrod That Describes In Detail How To Do It. Not To Complicated ,just Have To Get The Sleevr The Cable Is In Held Securly,and That It Achieves Its Max Pull Out At The Same Time That The Throttle Cable Achieves Wide Open Throttle .as I Recall.
Maybe Someone Else Can Ellaborate.

That is NOT a kick down cable. It is a Throttle Valve (TV) cable and it is the life blood of your transmission. It controls pressure and shift points. If it is mis-adjusted or not hooked up it can damage your trans, or worse kill it. If you do not know how to adjust it get yourself to a competent trans shop and have it configured properly. The life of your trans depends on it.

P.S. please quit calling it a kick down cable.

Vince

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Heavychevy1, you said you left the cable off for about a month, well depending on how much you drive and how hard you drive, the transmission could have suffered greatly after the first week.

With the cable unhooked, there will be no line pressure rise as you drive down the road.

The trans should have about 70psi of pressure in drive, sitting still, but as you accelerate and increase the amount of torque going thru the trans, since the load increases so should the line pressure.

This will allow the transmission the increase the clamping force on the clutchs and band. This is why 302 Z28 refers to it as "the life blood of your transmission" and by the way I couldn't have said it better myself.

If you've ever seen a clutch smoked [ stick shift car ] because of a weak pressure plate, you can use that example to compare what the clutchs inside your trans may now look like.

But you should still follow the advice you have been give in this thread and have someone, perhaps a trans shop, look at it and adjust it if necessary.

Briscoe,
Wouldn't it (if stock) have been at full line pressure at all times with a completely unhooked TV cable?

Nope, as the throttle is opend the cable is pulled, raising the line pressure.

Vince

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Vince,
I don't think you are as familiar with these trans as Briscoe or myself. I'm asking Briscoe for a reason.

Possibly you don't know more than Vince! He is correct un hooked it is at it's lowest pressure I know for a fact I have set up this trans with a pressure gauge a couple of times

Go back and re-read my post.

On a stock trans (no shift kit, etc) with all the stock checkballs in place, if the TV cable is completely unhooked (or broken) the trans defaults to max line.

You and Vince are incorrect.

You might go here and check this post out to shed some light on the subject.

http://www.atraonline.com/vbulletin....php?postid=211

Hold on fellas! The early 700's, 83 and older, did not use a TV failsafe ball.

So with these units if the cable was left loose line would not skyrocket.

Also, when installing some shift kits, and often when a 700R4 is rebuilt, it is common pratice to leave the TV failsafe ball out. Doing this would cause no line rise, if the cable was left unhooked.

Jakeshoe, to answer your question, yes. IF the trans has not been rebuilt,[ leaving the failsafe ball out ] and if a shift kit was not installed, again leaving the ball out, and if this is indeed an 89 unit and not a pre 83 unit, then yes, it should have jacked line up, making the upshifts very very late.

We're talking about static line at 125psi or better, depending on size of boost valve.

I couldn't or wouldn't drive my truck like this for a month, upshift out of first would be at 30mph or higher, depending on governor.

It would seen more logical to me that he fit in the no line rise category as opposed to actually driving it with sky high line and making mongo late upshifts.

I have said in the past, this site has a wealth of knowledgeable trans guys that post, a good failsafe measure in itself, against erroneous information.

I should have asked this to begin with, heavychevy1, is this the original trans, any rebuilds along the way, any shift kits installed?

Thanks for the clarification none of us knew all we thought we did

I'm not advocating leaving the TV cable unhooked, for the reasons Briscoe mentioned, and for the fact that usually the TV exhaust checkball is left out on rebuild.

I'm just stating if this is a stock '89 unit, and the TV cable is completely unhooked, line will not be low and the trans isn't going to burn up due to low pressure as a couple of people posted.

I did not know the 83-earlier units didn't have the feature, so I learned something new too.

We're just having fun here and trying to help some people along, so it's all good. And I don't care if that saying is not in vogue anymore, I like it.

As we post our opinions, sometimes we are going to disagree, thats to be expected. No big deal. Here is an example of how things could go bad.....

If jakeshoe wanted to, he could have nailed me on the failsafe ball thing, jakeshoe, I know you knew about it and you knew I knew about it, as well.

Now being a courteous fella like he is, jakeshoe gave me a shot to explain my thinking , which I do appreciate. no one wants to be called out and possibly look bad, especially if he's supposed to know what the heck he's talking about. I have 30 years in the trans repair business. I should know.

Guys like jakeshoe, Crosley,chasmac and a bunch of other guys that post a lot, they know what there talking about.

I sure don't know everything and I hope I never come across that way.

I learn stuff all of the time from this forum, I;m glad to be a part of it, I'm just having some fun and trying to help some people along the way.

And by the way, XNTRCI-T, that popcorn thing, was hilarious!