Triple flush
Le Mans Master
Joined: Nov 2015
Posts: 7,382
Likes: 3,501
From: Lake Havasu City Arizona
Race Director
Joined: Oct 2008
Posts: 16,648
Likes: 7,719
From: NJ
My girlfriend has a 2019 Stingray 1LT with the 8-spd automatic. I don't notice any "shudder" in her car at all. I plugged in the Range AFM device today, so it now stays in V8 mode all of the time. It has 1,500 miles on it. My car is a 2017 Stingray with the 7M, so it is not an issue for me.
Did GM fix the 'shudder' problem for the 2019 models? Did they use a different fluid for the transmission than earlier model years? Just curious.
Did GM fix the 'shudder' problem for the 2019 models? Did they use a different fluid for the transmission than earlier model years? Just curious.
The breakaway point was February 2019 builds.
New fluid came out in January 2019.
I have a 19 being built in a few weeks so I'm on this lol.
I just had the fluid flush done in my 16 other day. Just to do it so the next owner doesn't even have to think about any issues should they come up.
Some of these Corvette Plant people and engineers on the team are just aces...
Last edited by 24/Eray; Aug 3, 2019 at 04:57 PM.
Race Director
Joined: Apr 2017
Posts: 13,602
Likes: 12,864
From: Virginia
18-NA-355 is it however it was updated on July 9, 2019 per the below, and unfortunately the wording of the update is a bit ambiguous.
18-NA-355 and 19-NA-121 have been updated effective July 9, 2019 to eliminate the diagnostics portion within the TSB's and the labor times have been updated to reflect the removal of the diagnostic procedures. Vehicles presented with suspected shudderwithin the published build dates should have the prescribed fluid exchange procedure performed. The fluid exchange procedure has been very effective at permanently eliminating Torque Converter Shudder.
18-NA-355 and 19-NA-121 have been updated effective July 9, 2019 to eliminate the diagnostics portion within the TSB's and the labor times have been updated to reflect the removal of the diagnostic procedures. Vehicles presented with suspected shudderwithin the published build dates should have the prescribed fluid exchange procedure performed. The fluid exchange procedure has been very effective at permanently eliminating Torque Converter Shudder.
Last edited by Kevin A Jones; Aug 3, 2019 at 10:22 PM.
Drifting
Joined: Jul 2016
Posts: 1,902
Likes: 1,164
From: Keswick, Virginia
We just put my girlfriend's Corvette away for the week - forgot to look at the build date tag on the door jamb. Doh!
I suppose that if she bought it in May that it was built after February 1st - since Criswell moves their cars pretty fast. If her car has the "old" A8 fluid, will any GM dealer refill it with the proper stuff. It only has 1,500 miles on it - so I suspect that any problems will take awhile to manifest themselves.
I am so glad that my 2017 has a manual transmission in it.
I suppose that if she bought it in May that it was built after February 1st - since Criswell moves their cars pretty fast. If her car has the "old" A8 fluid, will any GM dealer refill it with the proper stuff. It only has 1,500 miles on it - so I suspect that any problems will take awhile to manifest themselves.
I am so glad that my 2017 has a manual transmission in it.
Race Director
Joined: Apr 2017
Posts: 13,602
Likes: 12,864
From: Virginia
We just put my girlfriend's Corvette away for the week - forgot to look at the build date tag on the door jamb. Doh!
I suppose that if she bought it in May that it was built after February 1st - since Criswell moves their cars pretty fast. If her car has the "old" A8 fluid, will any GM dealer refill it with the proper stuff. It only has 1,500 miles on it - so I suspect that any problems will take awhile to manifest themselves.
I am so glad that my 2017 has a manual transmission in it.
I suppose that if she bought it in May that it was built after February 1st - since Criswell moves their cars pretty fast. If her car has the "old" A8 fluid, will any GM dealer refill it with the proper stuff. It only has 1,500 miles on it - so I suspect that any problems will take awhile to manifest themselves.
I am so glad that my 2017 has a manual transmission in it.
By the way, I'm in Hanover County as well.
Last edited by Kevin A Jones; Aug 4, 2019 at 04:46 PM.
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Instructor
Joined: Oct 2013
Posts: 223
Likes: 26
From: Monclova Ohio
I took mine in and they said it didn't have the shudder using I forget which meter. The tach jumping they said they couldn't duplicate. I call BS on that one. Anyway, they said it was noted in case of problems down the road. I run the Range all the time so I guess I will have to have them check it every time I take it in for something.
Team Owner
Joined: Sep 2000
Posts: 25,008
Likes: 2,707
From: Far NW 'burbs of Chicago
St. Jude Donor '13
^^^
When did you take it in?
The revised bulletin that is supposed to allow "flush on demand" has been out less than a month.
And of course, some dealers are just dicks.
When did you take it in?
The revised bulletin that is supposed to allow "flush on demand" has been out less than a month.
And of course, some dealers are just dicks.
Banned Scam/Spammer
Joined: Jan 2019
Posts: 346
Likes: 131
slant6:
No!
Class action law suite: April 25,2019: Corvette's affected-2015-2019 auto transmissions, Type: 8L45/8L90.
The lawsuit claims the issue's source is the torque converter, which may be exposed to undue friction. Eventually, the gears may not function properly as metal shavings move throughout the transmission, an alleged issue in the lawsuit.
*13 technical service bulletins, none have remedied the problem absolutely!
Many thanks,
Ray
Disclosures: Rayland's secondhand, 2/2016 base-model, 19,450K, original trans fill, has had NO auto transmission trouble!
"Noblesse Oblige"
No!
Class action law suite: April 25,2019: Corvette's affected-2015-2019 auto transmissions, Type: 8L45/8L90.
The lawsuit claims the issue's source is the torque converter, which may be exposed to undue friction. Eventually, the gears may not function properly as metal shavings move throughout the transmission, an alleged issue in the lawsuit.
*13 technical service bulletins, none have remedied the problem absolutely!
Many thanks,
Ray
Disclosures: Rayland's secondhand, 2/2016 base-model, 19,450K, original trans fill, has had NO auto transmission trouble!
"Noblesse Oblige"
Team Owner
Joined: Sep 2000
Posts: 25,008
Likes: 2,707
From: Far NW 'burbs of Chicago
St. Jude Donor '13
See my post #26 above. I've seen a copy of the bulletin and the section about using the pico scope to analyze the vibration is gone.
The dealer tech confirmed that the new policy is to simply do the triple flush if the owner complains about shudder.
The dealer tech confirmed that the new policy is to simply do the triple flush if the owner complains about shudder.
Last edited by Gearhead Jim; Aug 5, 2019 at 05:52 PM.
Burning Brakes
Joined: Aug 2004
Posts: 1,207
Likes: 147
From: St. Louis MO
https://www.corvetteforum.com/forums...de-shocks.html
That's a link to my recent thread, with the relevant page scanned from the bulletin.
That's a link to my recent thread, with the relevant page scanned from the bulletin.
That is a thread for "Bulletin for Mag Ride Shocks" but nothing for the Triple Flush?
Team Owner
Joined: Sep 2000
Posts: 25,008
Likes: 2,707
From: Far NW 'burbs of Chicago
St. Jude Donor '13
^^^
Thanks!
Clicking on the wrong thread...
I've corrected my post #35 in this thread.
If your local dealer doesn't know about the latest bulletin and how to find it, strongly consider taking your business elsewhere.
If you want to be (too) nice and help them do their job, have them look up GM bulletin #18-NA-355 from July 2019.
Thanks!
Clicking on the wrong thread...
I've corrected my post #35 in this thread.
If your local dealer doesn't know about the latest bulletin and how to find it, strongly consider taking your business elsewhere.
If you want to be (too) nice and help them do their job, have them look up GM bulletin #18-NA-355 from July 2019.
Last edited by Gearhead Jim; Aug 5, 2019 at 05:59 PM.
