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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 01-28-2006, 08:15 AM   #1
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Default weird shifting

ever since i got my car its always shift good when it cold but when it got warm it got kinda sloppy. so i got the fliud changed at the dealership. it didnt seem to fix it. well now its not wanting to shift into overdrive.
so i merge on the freeway and im going about 75 and the rpms are just sitting at 3200rpm and it should be about 2300rpm, im going down hill so know it isnt under a load. so i wait for a lil bit thinking they would go back down. well their not so i manually shift into 3rd then back to drive and the rpms drop down where they should be. any ideas?

i checked the fluid and its fine. i was thinking maybe some computer that tells the car when to shift was messing up cuz their is times when i goto pass someone or merge in to a busy street and the car just bogs out.

its not showing any codes but i gotta get my scanner back from my friend so scan the primlary(sp) codes.

any ideas?

edit: o and i noticed that the car shift hard once in a while and other times it will shift perfect.
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Old 01-28-2006, 10:28 AM   #2
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Do these cars have a modulator valve? I don't know anything about these transmissions, but on my dad'* truck, it did that exact same thing and it was his modulator valve.
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Old 01-28-2006, 11:28 PM   #3
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anyone?
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Old 01-28-2006, 11:48 PM   #4
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It'* just a thought but how is the motor temperature running? Are you sure your thermostat is holding the temp up high enough. IIRC the water temperature has to be a certain temp before the trans will shift into 4th gear. That'* in addition to being able to lock up the torque converter.
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Old 01-28-2006, 11:52 PM   #5
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the engine is cold. but i would think that it couldnt shift when its cold. i tol dmy wife what was goingon and she said i should just sell it and buy a trailblazer.
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