Flush recommendation
Team Owner
Joined: Jul 2004
Posts: 28,429
Likes: 3,278
From: Hartford WI
IF the GM answer is that they used the old fluid which worked fine on the A6 and it doesn't work on the A8 because it is hygroscopic and the A8 is more sensitive to the water in the fluid, which do you think will accomplish more? Dumping out as much fluid as possible, short of a tear down and refill or the triple flush or the dump and change filter? How will the range device help? Sure, it doesn't go into V4 mode and you don't see the problem but regardless, it is still sucking moisture in and screwing up things.
Thread Starter
Drifting
Joined: Nov 2017
Posts: 1,325
Likes: 581
From: Conway South Carolina
As far as I know the triple flush is still the go to since just draining the fluid won't get all the old out. I was told by one Chevy dealer that they have a machine now that pumps the old out, and the new in. I don't know anything about that. I would prefer the old way of draining, filling & driving, draining, filling & driving and doing it all one more time.
Burning Brakes
Joined: Apr 2021
Posts: 960
Likes: 270
From: Western PA
This is what I did with my 2017 Stingray. I had no tranny problems but wanted the new fluid.
Le Mans Master
Joined: Nov 2015
Posts: 7,382
Likes: 3,501
From: Lake Havasu City Arizona
Team Owner
Joined: Jul 2004
Posts: 28,429
Likes: 3,278
From: Hartford WI
I believe the TSB means there is a process to address an issue. It probably is covered under the warranty if you had one. It doesn't mean that it is a recall so, if you do not have a warranty, you pay the cost.
Drifting
Joined: Apr 2018
Posts: 1,323
Likes: 928
From: Burnt Hills NY
I'm in the process of purchasing a 2019 ZR1, A8 with 5600 miles. It has never had the triple flush done. I don't think it is exhibiting any of the shudder issues but I haven't been able to drive it due to the winter conditions in upstate NY. The in service date is 3/25/2019. The build date is 2/7/2019. I do not know what the transmission build date is. I'm assuming the 5/50 drivetrain warranty will expire in March which is before driving season starts here. I have a couple of questions.
1. Is the ZR1 transmission affected by the shudder ( I know it doesn't have the V4 mode)?
2. Is the flush covered under the 5/50 warranty?
3. If the answers to questions 1 and 2 are yes, is it worth the expense of trailering the car to a dealer to have the flush done?
Thanks for your help. I'm new to the A8. I had a 2014 with the M7 before.
1. Is the ZR1 transmission affected by the shudder ( I know it doesn't have the V4 mode)?
2. Is the flush covered under the 5/50 warranty?
3. If the answers to questions 1 and 2 are yes, is it worth the expense of trailering the car to a dealer to have the flush done?
Thanks for your help. I'm new to the A8. I had a 2014 with the M7 before.
Le Mans Master
Joined: Nov 2015
Posts: 7,382
Likes: 3,501
From: Lake Havasu City Arizona
I'm in the process of purchasing a 2019 ZR1, A8 with 5600 miles. It has never had the triple flush done. I don't think it is exhibiting any of the shudder issues but I haven't been able to drive it due to the winter conditions in upstate NY. The in service date is 3/25/2019. The build date is 2/7/2019. I do not know what the transmission build date is. I'm assuming the 5/50 drivetrain warranty will expire in March which is before driving season starts here. I have a couple of questions.
1. Is the ZR1 transmission affected by the shudder ( I know it doesn't have the V4 mode)?
2. Is the flush covered under the 5/50 warranty?
3. If the answers to questions 1 and 2 are yes, is it worth the expense of trailering the car to a dealer to have the flush done?
Thanks for your help. I'm new to the A8. I had a 2014 with the M7 before.
1. Is the ZR1 transmission affected by the shudder ( I know it doesn't have the V4 mode)?
2. Is the flush covered under the 5/50 warranty?
3. If the answers to questions 1 and 2 are yes, is it worth the expense of trailering the car to a dealer to have the flush done?
Thanks for your help. I'm new to the A8. I had a 2014 with the M7 before.
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Team Owner
Joined: Jul 2004
Posts: 28,429
Likes: 3,278
From: Hartford WI
Team Owner
Joined: Jul 2004
Posts: 28,429
Likes: 3,278
From: Hartford WI
Le Mans Master
Joined: Nov 2015
Posts: 7,382
Likes: 3,501
From: Lake Havasu City Arizona
Read this thread about issue with ZR1s and the dreaded shudder. In this thread you will read what one reliable poster has stated:
"TCC shudder" and cylinder deac. are not related and, if we are talking about ZR1's specifically, cylinder deac. is irrelevant because the LT5 does not have that system. The TCC shudder problem is caused by an incompatibility between the 8L90/8L45 transmissions and the first two ATF's GM released for those two gearboxes. The third version of the ATF seems to have solved the problem. My understanding is all or most ZR1s were built after GM switched ATF's the final time, so it would be rare to have a ZR1 with TCC shudder.
https://www.corvetteforum.com/forums...der-issue.html
"TCC shudder" and cylinder deac. are not related and, if we are talking about ZR1's specifically, cylinder deac. is irrelevant because the LT5 does not have that system. The TCC shudder problem is caused by an incompatibility between the 8L90/8L45 transmissions and the first two ATF's GM released for those two gearboxes. The third version of the ATF seems to have solved the problem. My understanding is all or most ZR1s were built after GM switched ATF's the final time, so it would be rare to have a ZR1 with TCC shudder.
https://www.corvetteforum.com/forums...der-issue.html
Team Owner
Joined: Jul 2004
Posts: 28,429
Likes: 3,278
From: Hartford WI
That's my question. If the issue is with the fluid, who does everyone bother with the AFM? All it does is show the problem. Even if you eliminate AFM from the get go, the problem is still going to be the fluid which damages the transmission whether you notice it or not.
Drifting
Joined: Apr 2018
Posts: 1,323
Likes: 928
From: Burnt Hills NY
Team Owner
Joined: Jul 2004
Posts: 28,429
Likes: 3,278
From: Hartford WI
Instructor
Joined: Feb 2022
Posts: 170
Likes: 47
Hey guys okay I just got my transmission flush done and I have a 2014 Stingray Z51 and the dealer here in BC Canada told me they don't do triple flush anymore and that they do it once drain out and fill? Anyone else hear of this my car has 67,000KMS or 41,000miles! This was very bazar to me. Anyways I wasn't have any issues with the A6 just wanted to be proactive!
Racer
Joined: Apr 2023
Posts: 285
Likes: 129
From: Metro Detroit
Hey guys okay I just got my transmission flush done and I have a 2014 Stingray Z51 and the dealer here in BC Canada told me they don't do triple flush anymore and that they do it once drain out and fill? Anyone else hear of this my car has 67,000KMS or 41,000miles! This was very bazar to me. Anyways I wasn't have any issues with the A6 just wanted to be proactive!