auto trans question

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Apr 9, 2013 | 08:50 PM

Beezie

Thread Starter

8th Gear

Joined: Apr 2013

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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

Apr 9, 2013 | 09:19 PM

l98tpi

Max G’s

Joined: Nov 2008

Posts: 2,751

Likes: 79

From: Monroe OH

NCM Sinkhole Donor

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.

Apr 9, 2013 | 09:47 PM

vetteoz

Safety Car

Joined: Jan 2004

Posts: 3,556

Likes: 13

Quote:

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

Apr 9, 2013 | 09:57 PM

TommyFox

Melting Slicks

Joined: Jun 2011

Posts: 2,392

Likes: 385

From: Leland , North Carolina

Quote:

Originally Posted by vetteoz

Mine did that when the uni joints were worn

2nd that.

Apr 9, 2013 | 10:20 PM

Joe C

Race Director

Joined: Aug 2000

Posts: 11,470

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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.

Apr 9, 2013 | 10:39 PM

Beezie

Thread Starter

8th Gear

Joined: Apr 2013

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Thanks for the quick responses. What should I expect to pay to have the u joint replaced?

Apr 9, 2013 | 10:46 PM

Beezie

Thread Starter

8th Gear

Joined: Apr 2013

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Quote:

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?

Apr 9, 2013 | 11:14 PM

383vett

Race Director

Joined: Apr 2003

Posts: 17,700

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From: moraga ca

Sounds normal to me.

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Apr 10, 2013 | 10:16 AM

Beezie

Thread Starter

8th Gear

Joined: Apr 2013

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trany knock

Quote:

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.

Apr 10, 2013 | 10:57 AM

#10

tbirdsps

Burning Brakes

Joined: Apr 2012

Posts: 888

Likes: 4

From: Ridgecrest Ca

My 90 does that. But only in D3. The shop says it won't hurt anything but some people are annoyed by it.

Apr 14, 2013 | 07:02 AM

#11

Joe C

Race Director

Joined: Aug 2000

Posts: 11,470

Likes: 765

Quote:

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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