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Old Apr 9, 2013 | 08:50 PM
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Default auto trans question
recently got a 91 Coup with auto trans. Just noticed today that just before I come to a complete stop I hear and feel a very slight bump. Seems to be happening when it downshifts to first gear. The trans seems to be performing very well other than this. Any thoughts? Thanks
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Old Apr 9, 2013 | 09:19 PM
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Have you reset your detent cable yet to see if that would remedy the issue? If not, try that. And change the fluid and install new filter and fluid.
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Old Apr 9, 2013 | 09:47 PM
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Originally Posted by Beezie
just before I come to a complete stop I hear and feel a very slight bump. Seems to be happening when it downshifts to first gear.
Mine did that when the uni joints were worn
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Old Apr 9, 2013 | 09:57 PM
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Originally Posted by vetteoz
Mine did that when the uni joints were worn
2nd that.
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Old Apr 9, 2013 | 10:20 PM
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i'm guessing you have the old downshift clunk issue. common 90/91 thing...

http://www.corvetteactioncenter.com/...ast+Down+Clunk

http://forums.corvetteforum.com/sear...rchid=35093976

http://forums.corvetteforum.com/sear...rchid=35093805
Last edited by Joe C; Apr 9, 2013 at 10:22 PM.
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Old Apr 9, 2013 | 10:39 PM
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Thanks for the quick responses. What should I expect to pay to have the u joint replaced?
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Old Apr 9, 2013 | 10:46 PM
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Originally Posted by Joe C
Does the trans have tobe removed to do this work? What can I expect to pay to have this done?
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Old Apr 9, 2013 | 11:14 PM
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Sounds normal to me.
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Old Apr 10, 2013 | 10:16 AM
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Default trany knock
Originally Posted by Joe C
Joe,

thanks for the links. I read them and they state this problem was solved in later model trans. The sound I am getting only started recently so I was wondering if this could be something else or would the sound happen even though the trans may have been a later model with the proper parts.
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Old Apr 10, 2013 | 10:57 AM
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My 90 does that. But only in D3. The shop says it won't hurt anything but some people are annoyed by it.
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Old Apr 14, 2013 | 07:02 AM
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Originally Posted by tbirdsps
My 90 does that. But only in D3. The shop says it won't hurt anything but some people are annoyed by it.
same here - my 90 had the "clunk," and it was definitely worse in D3 than in OD. took it to both a dealer and an independent transmission shop - both said, it shouldn't hurt anything. probably just sounds worse than it actually is...
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