C8 Problems
Race Director
Joined: Aug 2019
Posts: 12,351
Likes: 14,183
From: Central Illinois
The reality is, it's not a mid engine Molotov cocktail. I hope you don't believe it started leaking a mile before you took it in for service, it's been leaking for thousands of miles. Every day you have been driving it there has been fluid weeping out, you just didn't know about it.
Last edited by Phil1098; Dec 29, 2021 at 11:47 PM.
Safety Car
Joined: Nov 2021
Posts: 4,309
Likes: 3,830
From: Northern Illinois
It is, the car is worth at least $10k more than you paid for it. Get it fixed sell it to CarMax or trade it and buy the BMW. You really can’t get hurt right now buying a C8 Corvette. However the BMW resale is another thing.
Melting Slicks
Joined: Jan 2006
Posts: 2,298
Likes: 1,860
From: Oregon
I'm just amazed that Chevrolet does not have a fix for a leak, like a new oil pan or a better gasket. Usually they can fix these issues instead of replacing the entire trans. That has to be an expensive trans, and a big cost of labor hours to replace it.
Thread Starter
Racer
Joined: Mar 2014
Posts: 321
Likes: 84
From: Marco Island FL
Maybe you can top off the DCTF via the air breather tube periodically. Problem is, how fast is this leak?
Also, the DCTF is pretty expensive. If you think the 0W-40 ESP Mobile 1 oil is high priced, check the prices on the Pentosin FFL-4, haha!
So you never saw any oil on the garage floor? No oil on the aluminum plate? No CEL or codes? No trouble with the driveability?
I would seriously want to SEE that leak before I ditched that car to the dealer. Put a clean catch bucket underneath, open the drain, lets see how much fluid is in there. Replace the fluid back into the DCT, top it off, put some tracing powder around the porosity issue area and drive it for a day or two.
Then drain it back out again and compare the level, did the tracing powder show a leak down the side? It could still be a pan gasket issue maybe?
Also, the DCTF is pretty expensive. If you think the 0W-40 ESP Mobile 1 oil is high priced, check the prices on the Pentosin FFL-4, haha!
So you never saw any oil on the garage floor? No oil on the aluminum plate? No CEL or codes? No trouble with the driveability?
I would seriously want to SEE that leak before I ditched that car to the dealer. Put a clean catch bucket underneath, open the drain, lets see how much fluid is in there. Replace the fluid back into the DCT, top it off, put some tracing powder around the porosity issue area and drive it for a day or two.
Then drain it back out again and compare the level, did the tracing powder show a leak down the side? It could still be a pan gasket issue maybe?
Burning Brakes
Joined: Feb 2008
Posts: 791
Likes: 230
From: SoCal CA
To drive you car until the transmission arrives. It’s up to you what you want to do though.
If you are really this upset, get that car fixed under warranty then sell it while you can make a profit. It seems clear you will not be happy with the Corvette no matter what now.
If you are really this upset, get that car fixed under warranty then sell it while you can make a profit. It seems clear you will not be happy with the Corvette no matter what now.
Thread Starter
Racer
Joined: Mar 2014
Posts: 321
Likes: 84
From: Marco Island FL
Got the bad news today! Took my 2021 C8 in for the 7,500 mile service to be told the DCT is leaking and will need to be replaced.
Seriously, I thought the DCT issues were resolved by now.
Late June 2021 build VIN XXXXXXXXXXXXX8006
Guess I should have gone with the BMW.
Seriously, I thought the DCT issues were resolved by now.
Late June 2021 build VIN XXXXXXXXXXXXX8006
Guess I should have gone with the BMW.
Great job Tremec.
Race Director
Joined: Aug 2019
Posts: 12,351
Likes: 14,183
From: Central Illinois
7 Speed TR9070
8 Speed TR9080 transaxle
Last edited by Phil1098; Dec 30, 2021 at 06:33 PM.
Melting Slicks
Joined: Aug 2018
Posts: 2,781
Likes: 3,105
Got the bad news today! Took my 2021 C8 in for the 7,500 mile service to be told the DCT is leaking and will need to be replaced.
Seriously, I thought the DCT issues were resolved by now.
Late June 2021 build VIN XXXXXXXXXXXXX8006
Guess I should have gone with the BMW.
Seriously, I thought the DCT issues were resolved by now.
Late June 2021 build VIN XXXXXXXXXXXXX8006
Guess I should have gone with the BMW.
Either way you should sell and buy your BMW. A very good friend of mine had a couple BMW’s and will never own another one. In his words there were way too many issues for what they cost him. Good luck.
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Melting Slicks
Joined: May 2021
Posts: 2,562
Likes: 1,579
If the "case" has a porosity issue, they have to replace the entire transmission.
There is a region where the metal is not flowing through the mold very well and leading to leaks. They can seal it using a high pressure sealant, but that requires taking the entire transmission apart, also requiring the DCT to be removed. If they are going to go that far, they will probably just scrap the case and perhaps re-use the internals.
So basically, if you have a porosity issue type leak, it's a DCT swap that is required.
If it's a pan gasket/seal, that's another matter entirely which is why I suggested he digs a little further to CONFIRM where the leak is coming from. I wouldn't just take their word for it without asking if they did the tracing powder test or not.
If it was a very slow leak, I would add some DCTF via the breather tube and just keep driving it until the DCT part comes in.
There is a region where the metal is not flowing through the mold very well and leading to leaks. They can seal it using a high pressure sealant, but that requires taking the entire transmission apart, also requiring the DCT to be removed. If they are going to go that far, they will probably just scrap the case and perhaps re-use the internals.
So basically, if you have a porosity issue type leak, it's a DCT swap that is required.
If it's a pan gasket/seal, that's another matter entirely which is why I suggested he digs a little further to CONFIRM where the leak is coming from. I wouldn't just take their word for it without asking if they did the tracing powder test or not.
If it was a very slow leak, I would add some DCTF via the breather tube and just keep driving it until the DCT part comes in.
Melting Slicks
Joined: May 2021
Posts: 2,562
Likes: 1,579
But it is a very different transmission. All new case design. Integral diffs, shallow pan, different solenoid / valve body locations, +1 gear, etc etc...
The TR9080 is such an abortion that McLaren is using it now too. Who knew!
Burning Brakes
Joined: Jan 2021
Posts: 849
Likes: 731
From: Kearney, NE
Drive it and enjoy it, Transmission fluid is NOT extremely flammable, It is just seeping, if it was actually leaking at an alarming rate, you would of seen it on the floor running between the panels. You can drive it for several months before you would even have to think about adding fluid. And who cares, it is being replaced anyway, the sky is not falling, You will be fine.
Heel & Toe
Joined: Sep 2021
Posts: 15
Likes: 2
Mine has been at the dealer for 2 weeks and they said it would be at least 3 before the transmission guy gets to it. I had the thought of fixing under warranty and selling it, but then a new one is more expensive, and the warranty price will go up too. Lemon law same thing, in Florida is just 3 weeks out.
Im thinking if anything the extended and factory warranties will have shell out fixes and cash for years to come. I will get my extended warranty money back for sure.
Im thinking if anything the extended and factory warranties will have shell out fixes and cash for years to come. I will get my extended warranty money back for sure.
Thread Starter
Racer
Joined: Mar 2014
Posts: 321
Likes: 84
From: Marco Island FL
Probably better to say it is an "evolution" of the TR9070.
But it is a very different transmission. All new case design. Integral diffs, shallow pan, different solenoid / valve body locations, +1 gear, etc etc...
The TR9080 is such an abortion that McLaren is using it now too. Who knew!
But it is a very different transmission. All new case design. Integral diffs, shallow pan, different solenoid / valve body locations, +1 gear, etc etc...
The TR9080 is such an abortion that McLaren is using it now too. Who knew!
Pro
Joined: Sep 2017
Posts: 734
Likes: 551
From: North Carolina
Got the bad news today! Took my 2021 C8 in for the 7,500 mile service to be told the DCT is leaking and will need to be replaced.
Seriously, I thought the DCT issues were resolved by now.
Late June 2021 build VIN XXXXXXXXXXXXX8006
Guess I should have gone with the BMW.
Seriously, I thought the DCT issues were resolved by now.
Late June 2021 build VIN XXXXXXXXXXXXX8006
Guess I should have gone with the BMW.
Melting Slicks
Joined: May 2021
Posts: 2,562
Likes: 1,579
Intermediate
Joined: Dec 2021
Posts: 30
Likes: 22
Where have you seen reports of GT500s having transmission issues at the same rate as the C8? I have done searches looking for this very thing and have pretty much seen the opposite. I am a member at Mustang6G too and there would be complainers out in droves if that were the case...instead I see one thread about a guy with a leak and another where they compare the trans from both with the GT500 having far fewer reported issues. I will say at least the transmission fluid fill is much easier on the GT500 which is a bonus based on how often it has to be changed. The filter change is about the same. I really like everything about the C8 except what I am seeing around this DCT. Maybe when I am ready to look into a two seater in a few years, they will have this ironed out.
Race Director
Joined: Aug 2019
Posts: 12,351
Likes: 14,183
From: Central Illinois
Melting Slicks
Joined: May 2021
Posts: 2,562
Likes: 1,579
Where have you seen reports of GT500s having transmission issues at the same rate as the C8? I have done searches looking for this very thing and have pretty much seen the opposite. I am a member at Mustang6G too and there would be complainers out in droves if that were the case...instead I see one thread about a guy with a leak and another where they compare the trans from both with the GT500 having far fewer reported issues. I will say at least the transmission fluid fill is much easier on the GT500 which is a bonus based on how often it has to be changed. The filter change is about the same. I really like everything about the C8 except what I am seeing around this DCT. Maybe when I am ready to look into a two seater in a few years, they will have this ironed out.