C7 Auto transmission
Thread Starter
Instructor
Joined: Jun 2017
Posts: 227
Likes: 43
From: Maple Valley Washington
C7 Auto transmission
Okay, I know there has been lots of talk about the C7 trannys. Does anyone know what percentage of automatic transmission actually went bad? Is it 20% or what? My 2017 Vette does not show any problems yet. I have 11000 miles on it. My dealer will not do anything if it looks okay. Any ideas out there? TIA!
Race Director
Joined: Apr 2014
Posts: 10,460
Likes: 1,750
From: North Texas
Okay, I know there has been lots of talk about the C7 trannys. Does anyone know what percentage of automatic transmission actually went bad? Is it 20% or what? My 2017 Vette does not show any problems yet. I have 11000 miles on it. My dealer will not do anything if it looks okay. Any ideas out there? TIA!
Le Mans Master
Joined: Jun 2002
Posts: 6,433
Likes: 3,624
From: Commerce Texas
Two of my friends have A8s, one in a '15 with about 80,000 miles and another with an '18 with about 70,000 miles - neither has had any problems. The friend with the '15 shipped his to Europe for a year and drove all over the continent....
I just traded a '15 MN7 with 97,000+ miles for a '19 A8.... not worried in the least.
I just traded a '15 MN7 with 97,000+ miles for a '19 A8.... not worried in the least.
Burning Brakes
Joined: Jan 2020
Posts: 808
Likes: 399
From: NW Georgia
I have a 2016 Stingray with about 12,800 on it with the A8 and have had no issues at all. I did have the triple flush done about 3 months ago just for peace of mine, it is covered under the powertrain warranty, was done at the local dealership with no questions asked, May just be in my mind but it does seem to shift a little quicker after having the flush performed. I personally think that most of the problems with the A8 transmissions are related to the AFM going from 8 cylinder to 4 cylinder mode, think that is what causes most of the reported shudder problem with the Corvette and all other GM vehicles that are equipped with AFM. Think it is not only hard on the transmission and torque converter but also the lifters in the engine over time, at least that is according to my local mechanic that has worked on all my vehicles for years. Easily fixed on both potential problems with a Range Device to keep it in V8 mode all the time.
Le Mans Master
Joined: Nov 2015
Posts: 7,382
Likes: 3,501
From: Lake Havasu City Arizona
It is difficult to tell what the percentage is. Basically it is an issue. Just like wheels on the GS and Z06, and 3LZ and 3LT dashboards. No one individual has cited a percentage of failures that would be considered to be accurate. I would just say this. The majority don't have issues. From here it is all guess work. I have a 2016 Stingray with 133,000 miles on it and never had a problem. I have a 2019 Z06 and never had a problem with the A8, but,,,,,my torque tube did fail. But you hear very very little of failures with that part. It is rare.
I use the Range device in both cars and made sure I went to the latest transmission fluid.
I use the Range device in both cars and made sure I went to the latest transmission fluid.
Last edited by joemessman; Sep 5, 2020 at 02:18 PM.
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As mentioned, the triple flush is a good thing to have done if you have the A8. Perhaps if you are on good terms with the service manager, they will do the work under warranty.
