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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 11-10-2006, 09:27 AM   #1
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Getting slight thump as tranny transitions from 2nd to 1st gear when slowing to a stop. Also, when checking tranny fluid does the engine need to be running?, or do I just need to make sure the engine is at operating temp?
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Old 11-10-2006, 09:31 AM   #2
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Not sure about the thump

To check,
Engine running, up to temp. Then go through all the gears, hop out..and check with engine running.
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Old 11-10-2006, 09:33 AM   #3
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Thanks!
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Old 11-10-2006, 09:33 AM   #4
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You need to have both the trans and the engine at operating temp to check the fluid. After that, check the trans oil for proper level, smell, and look at the color. Wipe it on a clean white rag of some sort. Then get back to us.
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Old 11-10-2006, 09:41 AM   #5
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Fluid level is right on. Does anyone know what I might be getting this thump? It is not a big thump but I can notice it whenever it downshifts to first gear. Just started about 3 days ago.
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Old 11-10-2006, 09:43 AM   #6
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Fluid is clean, no burnt smell.
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Old 11-10-2006, 09:43 AM   #7
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Possibly a sticking solenoid, check ball, or blocked passages.

When was the last time you changed the fluid in it?


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Old 11-10-2006, 09:48 AM   #8
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Tranny was rebuilt about 2 and half years ago. Added tranny cooler. Only happens when rolling to a slow stop. During quick stops I do not feel it.
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Old 11-10-2006, 09:53 AM   #9
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What'* that 2.5 years in mileage?
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Old 11-10-2006, 09:55 AM   #10
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about 14000 miles.
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