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Old 12-20-2008, 03:50 PM   #1
ND4g
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Transmission or TV Cable adjustment

I may be losing my tranny.... all of a sudden the transmission starting shifting at a higher than normal RPM. The consequence was when driving though my neighborhood, which is a quiet development, with lots of kids, the shift from 1-2 was somewhere from 2500-3000 RPM, meaning I had to accelerate above 30 to get it to up-shift. Not good!! The result was when "lumbering" thru the quiet streets I was going as slow as possible to keep the engine from screaming and causing people to look as if I was taking off or something.
She seemed as if when I back off the accelerator, it would drop into neutral instead of downshifting and doing an engine break thing which it should.
I looked here at the sticky posts and thanks to Dan85Vette I found some stuff about the adjustment for the TV cable. I brought the car into a vette specialty shop and they made the adjustment which only lasted long enough for me to bring the car from the shop back to my office when I picked it up at lunchtime. It felt just as it should be, as in, fixed and back to normal.
However, when I drove the car home, it never got out of 1st gear. I couldn't find a shift point.
It appears as if the adjustment the shop made to the cable slipped and was worse. they also left me with a hint that there may be internal issues and I will need to bring it back in for an overhaul/rebuild in a couple of months out to maybe a year. They suggested it was ok to drive around near home, but not recommended to take it out on the road for long trips.

OK, here is my question if any of you are still with me...
Is there a locking mechanism to keep this TV Cable adjustment from slipping? I am trying to show the picture here below (as soon as it is approved). The piece circled on the left looks loose or maybe even broken? The circled area on the right, is how I have it manually adjusted per Dan85Vette's writeup.
Thanks for any comments and help.
Rich

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Old 12-20-2008, 05:59 PM   #2
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The TV cable adjustment does not easily slip, unless the adjuster is damaged, which is unlikely. The TV cable adjustment is not to be used to correct or alter shift points. It has one correct adjustment position. Any other position other than the correct adjustment can seriously damage your transmission. The 700R4 transmission rarely suffers minor, easily correctable problems. Your symptoms sound like a transmission on it's last legs.
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Old 12-20-2008, 06:20 PM   #3
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Your pic was approved. I posted it up for you. The way you adjust the TV cable is to press the D shaped button, thats the one in the middle of the two circles you made in your picture. Hold the button in and with your other hand put your throttle to the wide open position, put a little pressure on it when it is in the wide open position. Let go of the button and you will hear the cable ratchet into its proper position. Let go of the throttle, thats it your done. If the transmission still shifts funny, then you need to get it checked out.
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Old 12-20-2008, 08:16 PM   #4
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The pic looks like your adjustment is at maximum loose.
Push the button, and pull the cable housing toward the firewall. While holding the cable back, let o of the d shaped button, then rotate the throttle open.
If you are having difficulty, get someone to do it for you without moving the vehicle.
A loose tv cable will fry a trans in less than a mile.
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Old 12-21-2008, 01:18 PM   #5
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My car started doing the same thing as your car only my car would finally up shift after driving it for 3 to 4 minutes then it would up shift and work correctly for the rest of the day and then do the same thing all over again the next day. It turned out to be a broken roll pin attaching the governor drive gear to the governor. If the TV cable adjustment doesn't fix your problem I would take a look at the governor it is easily removed from the trans.
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Old 12-21-2008, 06:13 PM   #6
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While cleaing up my engine once, I depressed that D clip, and pulled on the housing, didnt realize what Id done until I tried to drive to the car show I was headed to...The car was revving really high in 1st, then slipping casually into 2nd, then almost immediatly into 3rd, it was nearly impossible to get into OD.

Drove it to school the next day, only got worse.

Came home and got on CF/C4Gen and they showed me how to adjust the TV cable, sure enough it worked fine after that, I moved it back a little past dead center and it shifts really good. My only problem is it wont go into 4th until Ive driven it 2-3 miles....like my filter is stopped up or something.

Also, how is your fluid?

Crank it up, Puill it back to 1st, up to 2nd, D, OD, Neutral, Reverse, Then into park, check fluid then.
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Old 12-21-2008, 08:29 PM   #7
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Fluid level is good (and good color).... I changed it (and of course the filter) as one of the first maintenance functions after buying the car back in February, about 3k miles ago. Just turned 100k 2 months ago on a trip between Ft. Lauderdale to Orlando and back.
Everything has been fine until, as I said in my original post, the symptoms developed about a week ago.
I didn't drive it today, but I had it out yesterday for the evening with wife, and the car was behaving nicely after my adjustment yesterday afternoon.
Also, performed the road test diagnostics after the adjustment, just as prescribed in the Haynes Manual, and she is performing the upshifts, downshifts, and engine breaking, just like it is supposed to now.
Ccould the cable simply have slipped out of its normal setting? Is this something I need to watch over the long term?
Thanks for all your responses.
Rich
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Old 12-22-2008, 01:05 PM   #8
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Well Ive seen two different ways from you guys on how to correctly adjust the tv cable. My chilton manual told me how to re-set, which is to hold the button while pushing the cable housing towards the firewall then releasing. But I see that you guys say to push the button and move throttle to WOT, then release. Which is the correct procedure ???
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Old 12-22-2008, 02:08 PM   #9
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Okay, just curious since this thread is going on....whats the TV cable and what does the TV stand for? And dont say television!
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Sounds like fun...
Old 12-22-2008, 09:11 PM   #10
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Quote:
Originally Posted by The_Phoenix View Post
Okay, just curious since this thread is going on....whats the TV cable and what does the TV stand for? And dont say television!
The cable is hooked to the THROTTLE VALVE in the trans.
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Old 12-22-2008, 09:13 PM   #11
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Quote:
Originally Posted by hoopty View Post
The cable is hooked to the THROTTLE VALVE in the trans.
Aah okay. Hmm...I'll just go look up what that is instead of asking you guys part by part what the heck is in an auto trans.
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Sounds like fun...
Old 12-22-2008, 09:22 PM   #12
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Quote:
Originally Posted by vette_85 View Post
Well Ive seen two different ways from you guys on how to correctly adjust the tv cable. My chilton manual told me how to re-set, which is to hold the button while pushing the cable housing towards the firewall then releasing. But I see that you guys say to push the button and move throttle to WOT, then release. Which is the correct procedure ???
Both, you must push the cable housing back into itself before allowing the cable to pull it back out to the correct position. The portion of the cable housing that retracts back into the housing is commonly referred to as the needle. If you look closely you can see the teeth on it. It acts as a stop for the cable. It should be adjusted so the throttle valve is opened fully at wide open throttle.
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Old 12-23-2008, 05:50 PM   #13
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Yep hoopty has got it, the teeth should hold the TV cable in place. Put a mark on it if need to be to make sure it's not slipping.

If you can cross the tv cable adjustment off the suspect list, I'd have another reputable transmission specialist check out your Vette. I'd hate to assume the worst as my situation ended up being. I experienced a quickly progressing issue that is reasonably similar with you high rpm mis shifts but I was able to diagnose it through describing my issues to a few experienced mechanics and then dropping the pan. On the bright side, a new transmission was an awesome upgrade.
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