A8 Transmission failure tracking - Page 45 - CorvetteForum - Chevrolet Corvette Forum Discussion

Notices
C7 General Discussion General C7 Corvette Discussion not covered in Tech
Sponsored by:
Sponsored by:

A8 Transmission failure tracking

Old 01-01-2019, 10:42 AM
  #881  
kensredvette2
Junior Member
 
Member Since: Jul 2010
Posts: 45
Thanked 47 Times in 19 Posts
Default

An 83 page Class action lawsuit requesting Jury trial was initiated Dec 18, 2018 for A8 woes in Florida Southern district.

Duffy et al v. General Motors, Inc.

Hard to tell how this will actually proceed as the lawyers joust, banter, and collect fees. However, I am anxious to hear the GM 'Magic Mouse Milk Defense Strategy'!

Fortunately, I am not yet affected by shudder, only the small burps/hesitations caused by AFM.

Last edited by kensredvette2; 01-01-2019 at 10:54 AM.
kensredvette2 is offline  
The Following 5 Users Say Thank You to kensredvette2 For This Useful Post:
cdnrx1 (01-01-2019), joemessman (01-01-2019), Mehrlovin (01-01-2019), NSC5 (01-01-2019), speed4tu (01-02-2019)
Old 01-01-2019, 04:07 PM
  #882  
Mehrlovin
Junior Member
 
Member Since: Jan 2018
Location: Vienna VA
Posts: 33
Thanked 5 Times in 5 Posts
Default

Lawsuit is the way to go. They wont recall it, but, they could at least extend the warranty on it.

I'm really confused on what to do because my C7 GS has a stick shift but I feel like the clutch is already worn down at 4000 miles. Its 3500 to replace apparently. I thought of trading in a getting a Automatic but that doesnt seem to make sense either if it fails.
Mehrlovin is offline  
Old 01-01-2019, 10:56 PM
  #883  
javenius
CF Senior Member
 
javenius's Avatar
 
Member Since: Oct 2015
Location: Clinton Twp MI
Posts: 170
Thanked 44 Times in 36 Posts
Default

Originally Posted by pkincy View Post
Check TSB 18-NA-355. I believe it is the new TSB for the updated Mobil 1 ATF.
Do you have a copy of this new TSB? I am unable find a copy on any forums to date or on the Corvette Action Center website.

Thanks
Jim
javenius is offline  
Old 01-02-2019, 08:08 AM
  #884  
Tinkertech
CF Member
 
Member Since: Feb 2018
Posts: 91
Thanks: 0
Thanked 8 Times in 7 Posts
Default

I wonder when GM refers to the 'NEW' Mobil 1 LV ATF HP fluid if it the same formulation as the the original Mobil 1 LV ATF HP fluid and GM is only referring to it as 'NEW' to designate it from the older original Dextros HP fluid that they used in earlier A8 transmissions? Any thoughts?
Tinkertech is offline  
Old 01-03-2019, 09:28 PM
  #885  
GOC
CF Senior Member
 
Member Since: Aug 2017
Posts: 207
Thanked 46 Times in 35 Posts
Default

Originally Posted by Mehrlovin View Post
Lawsuit is the way to go. They wont recall it, but, they could at least extend the warranty on it.

I'm really confused on what to do because my C7 GS has a stick shift but I feel like the clutch is already worn down at 4000 miles. Its 3500 to replace apparently. I thought of trading in a getting a Automatic but that doesnt seem to make sense either if it fails.
What do you mean by "worn down", it's slipping? It shouldn't have these issues that the auto has.
GOC is offline  
Old 01-03-2019, 10:03 PM
  #886  
mpdugas
Junior Member
 
Member Since: Dec 2013
Location: Houston Texas
Posts: 25
Thanked 1 Time in 1 Post
Default A8 shudders may have another contributing problem source.

I remember when Tadge was filmed in the Corvette factory, standing by the power-train assembly, which included the motor, drive-line assembly and rear transmission and differential.

He mentioned something in that video about how the AFM sets up harmonic problems in the drive-line and how the drive-line assembly, in which the prop shaft spins, had to be made over 300% stiffer to handle those vibrations:


Look at or about 1:20; he talks about the vibrations caused by the four cylinder mode.

I often wondered about that when I hear about the A8 shuddering problems. Maybe those big bearings at either end of the drive line assembly contribute to the shuddering, not just the A8 itself.

I'm lucky enough to not have that problem in my M6, but I AM considering buying an A8.
mpdugas is offline  
Old 01-03-2019, 11:39 PM
  #887  
Mehrlovin
Junior Member
 
Member Since: Jan 2018
Location: Vienna VA
Posts: 33
Thanked 5 Times in 5 Posts
Default

Originally Posted by GOC View Post
What do you mean by "worn down", it's slipping? It shouldn't have these issues that the auto has.
Well the bite point for the clutch rose again and its getting fairly high. I feel like there is some minor slippage though passed the clutch tests I found online (when the vehicle stalls quickly instead of slowly fading). Going to take it to the dealership and see what they say. I love the stick but I confess I've slipped it a few times on hills by accident in the city. Its just hard for me to balance it right.

https://www.corvetteforum.com/forums...nt-rising.html

Any feedback appreciated.


Mehrlovin is offline  
Old 01-04-2019, 09:38 AM
  #888  
speed4tu
CF Senior Member
 
speed4tu's Avatar
 
Member Since: Nov 2016
Location: LaGrange NC
Posts: 562
Thanked 82 Times in 61 Posts
Default

Originally Posted by mpdugas View Post

I'm lucky enough to not have that problem in my M6, but I AM considering buying an A8.
Why would you do that? I have an A8 with issues and am considering getting out of it. lol Playing GM's game about changing oil, putting miles on it instead of just fixing the problem is getting old really quickly. If I wanted a car to constantly take back for service I would have purchased something with 300K miles on it.
speed4tu is offline  
The Following User Says Thank You to speed4tu For This Useful Post:
thocar (01-04-2019)
Old 01-04-2019, 11:20 AM
  #889  
tnbirdieman
Junior Member
 
Member Since: Jul 2016
Posts: 22
Thanked 13 Times in 6 Posts
Default

My 2016 2LT Z51 with 35,000 miles just got the transmission replaced under SB 16-NA-364. I had the shudder, 3-5 second delay when putting into reverse while cold and 1-2 seconds on all warm shifts, I could stop on a down hill incline and put into reverse and the car would roll forward 3 to 5 feet before going into reverse, and I had extremely hard shifts from 1-2-3-4-5th gears. I hope this re-manufactured unit fixes my problems but I will not be holding my breath. Its a shame a car as fun to drive as this one is can be such a downer to own. This is probably my first and last Vette (at least with an A-8). I have an artificial right leg and can not drive a M-7. My car was in the shop from Dec 5th 2018 until Jan 2nd 2019. I bought it new in June of 2016. Build date of late Nov 2015. The car has never been tracked and honestly is not driven hard at all. The flex plate was replaced at 7500 miles.

Picture of service order is below:

Last edited by tnbirdieman; 01-04-2019 at 11:26 AM.
tnbirdieman is offline  
The Following User Says Thank You to tnbirdieman For This Useful Post:
speed4tu (01-04-2019)
Old 01-09-2019, 01:35 PM
  #890  
VVJJ
Junior Member
 
Member Since: Dec 2012
Posts: 12
Thanks: 0
Thanked 2 Times in 2 Posts
Default Manual mode turns off V4 (ECO Problem Causer)

Originally Posted by TANKRR View Post
Same here, Flush at 4,500 miles... its been 200 miles everything seems to be fine. Was told the wrong flued was used originally, Ate away at some components. New flued has new properties in it... Was told
if problem doesn't go away it requires a torque converter replacementů Rick Conti has a video on the subject. One other thing, if you encounter the shudder problem place it in manual mode it will go away. For some reason the shudder doesn't do it in manual mode. FYI
Manual mode turns off the V4 operation of your engine. I will never understand why they would ever want this in any vehicle! I have made exhaustive tests over the years and have never seen any increase in mileage....the internal rotational friction of the engine goes way up and the available torque is very much reduced. It is amazing they are wanting this to be fixed with snake oil changes to the transmission
.
I traded in my 2017 GS and ordered a 2019 GS figuring they might have the problem rectified as they have known about the problem for 3 years!

See GM Bulletin 18-NA-355 for the latest go round on this. Every A8 2015-2019 should be recalled. Every Cadillac, Chevrolet & GMC that they have made since 2015 included. I also am very sad that I traded my 2012 GS A6 for this mess.It did not have AFM and with an A6.......all the gears you would ever need !
VVJJ is offline  
The Following User Says Thank You to VVJJ For This Useful Post:
tboneinnc (01-15-2019)
Old 01-09-2019, 02:22 PM
  #891  
MidLife+
CF Member
 
MidLife+'s Avatar
 
Member Since: Jun 2018
Posts: 50
Thanks: 0
Thanked 8 Times in 7 Posts
Default

Another Update: 2016 Z06 A8

Last year I have had the flush done, torque converter replaced and the transmission valve body replaced. I run the Range device plugged in all the time.
This weekend I had an opportunity to drive the car on a trip of about 300 miles.... the shudder is still there! The wheels has been checked and are OK. If the problem was the torque tube would the vibrations be constant instead of intermittent?
MidLife+ is offline  
Old 01-09-2019, 07:30 PM
  #892  
mpdugas
Junior Member
 
Member Since: Dec 2013
Location: Houston Texas
Posts: 25
Thanked 1 Time in 1 Post
Default

Originally Posted by speed4tu View Post
Why would you do that? I have an A8 with issues and am considering getting out of it. lol Playing GM's game about changing oil, putting miles on it instead of just fixing the problem is getting old really quickly. If I wanted a car to constantly take back for service I would have purchased something with 300K miles on it.
because I would buy a 2019 A8, which is likely to have solved many of the problems inherent in the older version; the M7, with its crowded gates, is very uncomfortable to drive. there are no other choices if I'm to have a new Corvette.
mpdugas is offline  
Old 01-10-2019, 05:46 PM
  #893  
speed4tu
CF Senior Member
 
speed4tu's Avatar
 
Member Since: Nov 2016
Location: LaGrange NC
Posts: 562
Thanked 82 Times in 61 Posts
Default

Originally Posted by mpdugas View Post
because I would buy a 2019 A8, which is likely to have solved many of the problems inherent in the older version; the M7, with its crowded gates, is very uncomfortable to drive. there are no other choices if I'm to have a new Corvette.
I would think long and hard about that. I just got a call from the dealership doing a second oil change in mine. We're gonna have a talk before i leave with it and I am certain I am done with GM's faulty vehicles after this whole episode. Too many good cars out there do deal with overpriced junk.
speed4tu is offline  
The Following User Says Thank You to speed4tu For This Useful Post:
tboneinnc (01-15-2019)
Old Today, 03:20 PM
  #894  
joemessman
CF Senior Member
 
joemessman's Avatar
 
Member Since: Nov 2015
Location: Lake Havasu City Arizona
Posts: 4,180
Thanked 1,315 Times in 885 Posts
Default

Here is a link to Paul Koerner one of the top Corvette mechanics about transmission shudder.

Last edited by joemessman; Today at 03:20 PM.
joemessman is offline  
The Following User Says Thank You to joemessman For This Useful Post:
Gearhead Jim (Today)
Old Today, 06:08 PM
  #895  
Gearhead Jim
CF Senior Member
Support Corvetteforum!
 
Gearhead Jim's Avatar
 
Member Since: Sep 2000
Location: Chicago area
Posts: 20,661
Thanked 616 Times in 427 Posts
St. Jude Donor '13
Default

Originally Posted by joemessman View Post
Here is a link to Paul Koerner one of the top Corvette mechanics about transmission shudder.
https://www.facebook.com/corvettemec...1403670748088/
That's interesting, do you know the date of that video?

On our 2017 Z51 with the big tranny cooler, the highest trans temperature I've ever seen was about 160'F after multiple autocross runs.
They'd need to pre-heat the fluid before dumping in, or put a blowtorch against the tranny to get our temp up to desired.
Or maybe there's an easy way to bypass the cooler...
Gearhead Jim is online now  
Old Today, 06:17 PM
  #896  
joemessman
CF Senior Member
 
joemessman's Avatar
 
Member Since: Nov 2015
Location: Lake Havasu City Arizona
Posts: 4,180
Thanked 1,315 Times in 885 Posts
Default

Around last November. Pretty sure the 8th or so.
joemessman is offline  
Old Today, 06:20 PM
  #897  
MA ZO6
CF Senior Member
 
MA ZO6's Avatar
 
Member Since: Apr 2004
Location: Sarasota FL
Posts: 911
Thanked 19 Times in 9 Posts
St. Jude Donor '13
Default

My 2016 Z51 is the same, I have NEVER seen the 8 speed transmission temp above 125 degree even in very hot Florida weather under normal driving conditions. I did have my fluid changed to the new style in October to solve the shudder problem and the service report said NOTHING aside from changing the fluid. I wonder if the new procedure coming out will be to change the fluid (to ANOTHER new style) and do the relearn? The shudder has come back in mine so I WILL have the new procedure done once it is formally released.

Last edited by MA ZO6; Today at 06:21 PM.
MA ZO6 is offline  


Thread Tools
Search this Thread
Quick Reply: A8 Transmission failure tracking


Sponsored Ads
Vendor Directory

Contact Us About Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

© 2018 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: