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Old 12-01-2004, 01:52 PM
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[TH700R4] TCC-related vibrations

I have a problem with the TCC system in the 700R4 which is installed in mine '89 Camaro

It started around 4 months ago - I've noticed strange vibration/shudder and whirring noise. I've checked the torque converter bolts, U-joints, replaced tranny mount and even replaced the rear axle (I had to do that anyways because I wanted to rebuild original unit). I managed to find out that vibration source is a lockup clutch (I unplugged the TCC connector and it cured the problem).

Generally vibration occurs especially when the tranny is hot. If I apply the brake when the TCC is locked, and then I release the brake and depress the gas pedal slightly it's starting to 'shudder'. It seems it locks and unlocks like 5-6 times per second. Vibration goes away when I depress the gas pedal, or when I release it. TCC locks 'smoothly' after 2-3 shift (especially when tranny is cool - on hot tranny sometimes it's a bit harsh).

I've replaced the TCC solenoid with new one, checked the 4th gear pressure switch, replaced the filter and the ATF as well.

I havn't checked the brake pedal switch yet. I know it may also have something to do with TPS and speedometer cable.

I'll be grateful for any ideas or suggestions.

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Old 12-01-2004, 07:25 PM
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you say you checked the pressure switch.. how?

pressure check for leaks and apply . check the ohms with a digital volt / ohm meter?
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Old 12-01-2004, 08:57 PM
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tcc shudder

trans most likely has internal trouble input shaft and stator wear along with torq converter damage
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Old 12-02-2004, 07:59 AM
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So, the question is simple - do I need a new or remanufactured converter? (for example something like this:
http://tinyurl.com/5slr5 - I don't need hi-performance converter because this car is just a cruiser not a drag-machine)

Or maybe I should remove the converter and regenerate it (there is a guy here, who can do that for me).

I think I'll check the electrical components (brake switch, vss, tps) with the ALDL scanner and the laptop first tough.
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Old 12-02-2004, 05:34 PM
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tcc shudder

89 up 700 and 4l60e stator bushing wear and input shaft will run out and score shaft on bottom ring land the end result loss of oil circuit in 3-4 also tcc charge and tcc shudder and 3-4 clutch failure
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Old 12-03-2004, 07:34 AM
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Thanks for answer!
But I have additional questions:
Is it easy fix? (could you describe it step-by-step)? Is transmission overhaul required? I understand it's the front stator bushing I've got to replace (along with the front seal) (maybe you can give me some example of such part in some internet store?).
I can't fix it without pulling the tranny out, right?

Thanks again for your reply!

PS.: I must confess there _is_ a small but easly visible leak in front of the tranny!

Last edited by Airwolf; 12-03-2004 at 08:02 AM.
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Old 12-03-2004, 11:02 PM
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tcc shudder

yes rebuild is the best fix here, the trouble is the repair is almost complete disassemble. you can replace input shaft or complete drum, stator shaft will need replacement as well inside sleeve will be cut up from input shaft contact.
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Old 12-04-2004, 04:02 AM
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I understand that stator shaft is a part of the Torque Converter, so I can replace the shaft itself, or buy whole new unit, right?

Thanks for the info again, and sorry for my lame questions

Last edited by Airwolf; 12-04-2004 at 04:12 AM.
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Old 12-04-2004, 11:35 AM
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tcc shudder

the parts that I mention are transmission related, torque converter replacement is needed because the lock up disc is bunt or cover it rides against is distorted. the stator shaft I speak of is pump cover as gm calls it. not to be taken wrong here but if you not aware of these parts as mention this repair might be best performed by someone else.
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Old 12-04-2004, 01:03 PM
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Don't worry - I'm not going to rebuild it myself - I'm not only too lazy for that sort of job but also out of time and without proper tools (and knowledge) - I'm not familiar with the terminology because... I'm used to Polish terms to describe these parts ;-)
I couldn't find them in the ATSG Service Manual too

Anyways I need to know as much as it's possible about them, because I'll have to order them in the US (they're not freely avaible in Poland and even if I'll find them - price will be a 'little' too high for sure).

So, I understand I gonna need this:

http://cgi.ebay.com/ebaymotors/ws/eB...category=33727

+

http://cgi.ebay.com/ebaymotors/ws/eB...category=33727

+ Torque Converter

+ Master Overhaul kit

and I'm ready to go? Maybe it's also good idea to buy Corvette servo and better boost valve? And I'll add tranny cooler for sure too...
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Old 12-04-2004, 04:47 PM
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tcc shudder

ok I understand, the e bay parts looked like a fair deal
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Old 04-26-2005, 07:19 AM
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Just to let you guys know (maybe someone find this info usefull in diagnosing similar problem):

Mine transmission has been rebuild and everything works fine now.
It seems those vibrations were caused by worn lockup plate along with dammaged lockup clutch damper and turbine shaft wear.
Additionaly front bushing was severly worn, oil pump vanes were almost gone, there was also some internal oil leak - those factors most likely caused too low oil pressure for converter clutch apply.

airwold2 - again thanks for answers.
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