gears missing *final update* - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 06-11-2006, 04:25 AM   #1
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Default gears missing *final update*

i was driving today on the highway and i suddenly lose 4th gear and the TC. it would come and go the whole trip. what the hell is wrong?

first, we thought it was a bad clutch for 4th. then we thought it was the TCC. now we think it may be the vaccum regulator.

any inputs?
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Old 06-11-2006, 10:38 AM   #2
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The first question with something like this is what does your fluid look and smell like?

The second question is which trans does your 97 have? It was a mixed year for the L36. By the sound of your problem, I'd have to guess 4T65E.

When driving, and you lose 4th/TCC lockup, if you pop it in Neutral, turn off the car, restart, and drive, does it come back?
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Old 06-11-2006, 11:00 AM   #3
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new trans right.......warrenty??
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Old 06-11-2006, 11:14 AM   #4
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One more thing.....NOT the vacuum modulator. If it'* disconnected, the shifts will be firmer. It can POSSIBLY cause you to miss a shift if it fails in a manner that it lowers line pressure, but I don't think it'* likely. This would indicate that you have a 4T60 I suppose (coffee is sinking in slowly here).
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Old 06-11-2006, 12:19 PM   #5
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Do 4T65e'* have vacuum modulator?

Is there any chance the engine coolant is too cool to allow 4th and TCC to engage. Is the temp dial reading like it always did. I'm thinking the computer doesn't allow 4th and lockup until a certain coolant temperature is reached and the outside temps were relatively cool yesterday in Ind/Ohio.
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Old 06-11-2006, 12:20 PM   #6
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Do you by chance know how hot the trans is getting and what amount of slip is being detected within the TCC?

Some of these transmission issues will not set off the SES light but the PCM may have a stored code

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Old 06-11-2006, 12:34 PM   #7
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Quote:
Originally Posted by imidazol
Do 4T65e'* have vacuum modulator?

Is there any chance the engine coolant is too cool to allow 4th and TCC to engage. Is the temp dial reading like it always did. I'm thinking the computer doesn't allow 4th and lockup until a certain coolant temperature is reached and the outside temps were relatively cool yesterday in Ind/Ohio.
4T65'* don't have the Vac modulator. The PCM itself controls this in the 65'*. Considering the fact that he asked about it, he must have a 60, in which case the temperature will not have an effect on 4th or lockup. The only thing it has an effect on is limp mode for high temps.
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Old 06-11-2006, 01:09 PM   #8
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Correct, on the 94 and later for certain, the PCM looks for certain inputs.... You could have cold started your car and headed for the highway, as soon as you turn the ignition on the O2 sensor heats up, you start the car and very shortly thereafter the O2 is already giving the PCM a good signal... Say you are a block from the highway... You pull out and get up to 44-45mph and eventhough the engine is still cold, you'll hit TCC lock with the O2 data and correct Vehicle speed conditions are met... Once you get to 55-60 you will have the TCC locked even with a cold engine...

On the older cars 87-91, 92 and possibly 93 as this was a mixed year for the none heated O2 and heated O2... These cars will look for about 150F before the PCM will apply the TCC..

This small change was able to improve emissions and fuel economy... Every little bit counts

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Old 06-11-2006, 01:49 PM   #9
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i dont know what temp the tranny was running at, but whenever i would stop somewhere. when i would get back in and drive it would come back. and randomly it would have 4th/TC then it would go away.
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Old 06-11-2006, 01:52 PM   #10
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Forget temp, check your fluid, try my advice above about a shutdown on the roll and restart, and consider taking it back if it'* under warranty.
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