transmission clunk - 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 08-18-2008, 08:19 AM   #1
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Default transmission clunk

I have a 95 ssei. The concern that I have is when the car sits over night and I start it the next morning I get a clunk/knock from the transmission for about a minute. I checked the started and flywheel. im not sure what it is. It drives fine, it just makes a hideous noise that sounds like it is something solid/metal hitting. Any thoughts would help
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Old 08-20-2008, 07:17 AM   #2
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Old 08-20-2008, 07:41 AM   #3
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Could be any number of things from a bad axle, internal trans issues or a cracked flywheel.

Can you repeat it by shifting from D to R back and forth? If so..have someone do that while you look for movement in the drive line. Rule out the easily visible things first. Motor mounts, axles, wheel bearings.
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Old 08-20-2008, 10:26 AM   #4
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this happens before I put it in gear. as soon as I start the engine it makes that noise. it sounds like it is internal. I checked the flywheel as best as I could through the inspection cover. I also checked the starter. so no one has heard of this before?
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Old 08-20-2008, 12:21 PM   #5
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Are you absolutely sure it'* coming from the tranny? Sounds like you are describing a low end engine knock (crank bearing, lower connecting rod). GM V-motors with high mileage are known to do this, but only on startup, and will run a very long time with this issue. Running a slightly heavier oil viscosity usually quiets this.
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Old 08-22-2008, 07:18 AM   #6
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I took a long screwdriver and listened. it is coming from the tranny side. :(
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