Won't shift into OD, and torque converter w/not stay locked - 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 10-15-2006, 11:26 AM   #1
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Default Won't shift into OD, and torque converter w/not stay locked

On one hot summer day the tranny stopped shifting into OD. When I arrived at home I checked the fluid and it looked like it had boiled because it was way up on the dipstick.

I changed the fluid and filter to no avail.

Also the torque converter decided to unlock at about 2200 RPM.

It only has 150k on it.

Advice, please.

Thx.
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Old 10-15-2006, 12:18 PM   #2
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Do you have any slipping or hesitating 1-2 shifts?
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Old 10-15-2006, 12:25 PM   #3
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Can you put your year and trim level in your signature before we go any further?

There are distinct differences in transmissions from year to year.
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Old 10-15-2006, 12:29 PM   #4
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The transmission doesn't have any hesitant shifting. Under a hard acceleration it does shift a bit rough. Under normal acceleration it shifts just fine.

It is the SE model. Not sure about the trim level but it is all black (even the Pontiac emblem on the front), has a spoiler and ground affects.
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Old 10-15-2006, 12:39 PM   #5
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We need to know what YEAR. 19__ SE.
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Old 10-15-2006, 12:39 PM   #6
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At the top of this screen, click on profile. goto the bottom where it says Signature. Please put your year and trim in the box. This will let everyone know what kind you have. As Will has already said, different years have different transmissions. It helps us figure out what is wrong with your car.
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Old 10-15-2006, 12:45 PM   #7
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It is a 98 SE. L36 engine.
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Old 10-15-2006, 12:50 PM   #8
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Did you use synthetic fluid?

What does it look like NOW? Color, smell, level?

Does it ever shift into OD, or was it just that 'one hot summer day'?

Do you have a check engine light? If so have you had it scanned?

What RPM do you run with the shifter in OD, running 65mph on the freeway with cruise?

If it NEVER shifts into OD, I'd be getting a scantool on the car to determine if the PCM is even requesting TC lockup. There may be a non-trans related sensor or condition preventing it.
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Old 10-15-2006, 12:59 PM   #9
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Any speedometer problems?
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Old 10-15-2006, 01:06 PM   #10
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Willren:
I use syn blend oil
No unusual smells
Has never shifted into OD since that hot summer day
No codes
I always leave it in OD, and run it at freeway speeds (70+) and it never shifts to OD

Mike1995:
No speedometer problems
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