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Old 02-12-2005, 04:27 PM
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TH700R problem

Okay my fellow U/S friends, I've got some questions for you. My every day driver is a 94 Holden Commodore, that's RWD, Buick V6 powered and has the electronically controlled TH700R transmission. Up until 93, Commodores where using the TH700's with the old throttle cable set up. First question. What would my TH700R be equivalent to with what you've got on your soil? 2nd question. I think my torque converter lock up clutch has a problem. In the past, it used to initially shudder when it would lock up, say at around 50mph, if the engine was loaded more than usual. That did'nt bother me as the shudder was very brief. But now when cruising at 60mph (100kph) with the engine at 1850 RPM, the locked up torque converter will shudder continuously if I try to accelerate on part throttle. Of course, if I give it more throttle the converter unlocks relieving the symptoms. Prior to the shudder, I watch the tacho and accelerate. I notice the RPM being held at 1850 and then the needle jumps to about 1980RPM when the shudder occurs. In reading that, one would think I've answered my own question. However, it's possible that there's some kind of hydraulic pressure problem or whatever. The early Commodores had the old coil packs which were often breaking down and would be the source of many transmission complaints. Because, at say 45mph with the converter locker up, the faulty coil packs would break down under the low RPM loads and cause 2 cylinders to misfire, not one! This would cause a massive driveline shudder that would make you swear was due to the converter. Fix the misfire, and you've fixed the shudder. So it's with this that I was hoping is the cause of my problem. But I still think it's the converter. Last night when driving, I thought I'd flick the engine from LPG to Gas and see if it would do it again, and sure enough it did! I'm stepping out right now to check the leads and coil pack with my OHM's meter. Any help would be appreciated.

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Last edited by club327; 02-13-2005 at 12:23 AM.
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Old 02-13-2005, 01:23 PM
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The electronic controlled 700R here should be the 4L60E (not to be confused with 4L80E) .

As far as the rest, I am clueless to give a better answer than you could give yourself.
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Old 02-13-2005, 03:45 PM
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Cool

chances are there is a contol problem with the circuit for the converter lock up.


Worn lock / up valve bore , solenoid leaking pressure.


Very common if your Holden has the 4L60E tranny
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Old 02-14-2005, 02:12 PM
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Thanks for the replies. Crosley, is the lock up valve bore in the valve body? Or is it in the pump housing? I used to work on transmissions as an apprentice, but have not worked on them for about 15 years. I've never touched a GM 4speed apart from the usual servicing. There's this guy called Orto in Australia who runs a tranny shop and has this great website answering questions for people with their transmission problems. One guy has the same problem. Orto replied 'you may have an engine misfire, have that checked first'. 'Your transmission may require a fluid flush and change to restore the fluid friction properties' and 'your transmission may be due for an overhaul'. Here's his website. If you have not already found it then I'm sure you'll be impressed.
http://www.automatictransmission.com.au/orto.asp
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Old 02-14-2005, 10:27 PM
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Today I spoke to a couple of tranny specialists (er', not the cross dressing kind). One said I'd at least need a new converter, but the old one could have failed due to lack of pressure. If that's the case, then the new converter will prematurely fail and that it's time for a total o/haul. The next place I went to said stuff almost along the same lines. Fortunately, the transmission parts rep' was there who overheard us. He said there's quite a few fixes for the transmissions, like the Corvette servos (which you all know about I'm sure) and such. He mentioned the valve does wear the bore in the solenoid circuit (as mentioned by our very own Crosely!) and said there's a re-sleeving kits available as a fix. Oh and yes, my transmission is what you guys call the 4L60E.
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