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Yes, I really thought that this was going to be a bigger problem. Although when it is your car on the lift being gutted then it is a big problem. But so far only 3 forum members have came forward stating that their transmission has leaked and needed to be replaced. ChiTownVette is replacing a customer’s in Chicago, AWSM just had his replaced in California and mine being replaced in South Florida. If there are others, they have not replied on this thread. So three verified so far out of 30,000 cars is not a big problem. Unless….. you are one of the three! 😩
Yep agree, feel for the folks where it happens or where they had to drop the whole rear suspension to replace a ~$20 fuel level sensor in the C7! Also those with cracked 12 inch wide Vette wheels (which in 3 1/2 years did not have on my 2017 Grand Sport.)
Like the old saying, a "Recession" is when your neighbor loses their job. A "Depression" is when you do!
Seems to me that this issue is most likely the biggest cause of the "parts shutdowns" in production. The sad point is that transmissions have been using aluminum cast casings for over 45 years!
Yes, I really thought that this was going to be a bigger problem. Although when it is your car on the lift being gutted then it is a big problem. But so far only 3 forum members have came forward stating that their transmission has leaked and needed to be replaced. ChiTownVette is replacing a customer’s in Chicago, AWSM just had his replaced in California and mine being replaced in South Florida. If there are others, they have not replied on this thread. So three verified so far out of 30,000 cars is not a big problem. Unless….. you are one of the three! 😩
I would add one more. I think I mentioned earlier, there was a car that had just come into my dealership with the exact same issue. In fact, they ordered a transmission for that car at the same time they did mine and both new transmissions were delivered on the same truck. That car was waiting in the wings to be installed, saw it. Have not talked to the owner, so i don't know any details.
Seems to me that this issue is most likely the biggest cause of the "parts shutdowns" in production. The sad point is that transmissions have been using aluminum cast casings for over 45 years!
Some how I doubt it. Reminded of the aluminum body regular/flowmeters we made. In that case could not tell with the raw castings or even after machining of the mating bolted surfaces. BUT once the regulator was assembled and pressure tested a leak detect solution picked it up.
If Tremec could easily check the aluminum casting for porosity they no doubt would. Assemble, put it in the the car and pressurize - it pops up. As was indicated they are probably making casting changes to reduce the probability. BUT aluminum castings have porosity!
For what its worth, I was looking over my paperwork and found the part # of the replacement transmission they installed. It is: 11211601AEPX0013
Part # of the trans they removed is #1120350DEPX0134
For what its worth, I was looking over my paperwork and found the part # of the replacement transmission they installed. It is: 11211601AEPX0013
Part # of the trans they removed is #1120350DEPX0134
Seems to add credence to the report that the housing has been redesigned....
For what its worth, I was looking over my paperwork and found the part # of the replacement transmission they installed. It is: 11211601AEPX0013
Part # of the trans they removed is #1120350DEPX0134
just realized one of the pics I had posted earlier of the old part # when the tranny was still in the car differs slightly from the paperwork by one digit. I figured one of you eagle eyes would catch that so I'm only the messenger. My paperwork must have a typo. Don't have a pic of the new part #
I would add one more. I think I mentioned earlier, there was a car that had just come into my dealership with the exact same issue. In fact, they ordered a transmission for that car at the same time they did mine and both new transmissions were delivered on the same truck. That car was waiting in the wings to be installed, saw it. Have not talked to the owner, so i don't know any details.
Originally Posted by AWSM_06
For what its worth, I was looking over my paperwork and found the part # of the replacement transmission they installed. It is: 11211601AEPX0013
Part # of the trans they removed is #1120350DEPX0134
Thanks for the part numbers. I will try to get part numbers on my transmissions this coming week. Thanks for the information. Adding one more only makes four known transmissions replaced.
Thanks for the part numbers. I will try to get part numbers on my transmissions this coming week. Thanks for the information. Adding one more only makes four known transmissions replaced.
Should be on your paperwork when you pick it up. I believe its part of their documentation process. Good luck, And I am guessing there are several more who experienced this. Probably a lot folks that don't follow this forum or may have missed this post.
Should be on your paperwork when you pick it up. I believe its part of their documentation process. Good luck, And I am guessing there are several more who experienced this. Probably a lot folks that don't follow this forum or may have missed this post.
Yes, I’m quite sure that there are a lot more than four that had a leaking transmission casing and are getting a new transmission. I’m also sure that GM is not going to come forward and say just how many that number really is. I do hope for everyone’s sake that it remains a small number.
Yes, I’m quite sure that there are a lot more than four that had a leaking transmission casing and are getting a new transmission. I’m also sure that GM is not going to come forward and say just how many that number really is. I do hope for everyone’s sake that it remains a small number.
I have found in this forum and on FB pages for the C8 that problems for just a few people become a major issue when in reality they don't happen that often to owners.
My son-in-law owns two Matco Tool distributorships. One of the stops on his route is a Chevrolet dealer that has several very good Corvette certified mechanics. He knew earlier this year, when I sold my C6, that I was contemplating ordering a C8. One day he sent me pictures of a 2020 C8 on a lift in a service bay with a hole in the block caused by the valve guide issue. He called and told me there were two more 2020s sitting in the service lot with the same problem. I did some research and found it was on a small number of cars produced in 2019 I believe, that Chevrolet had been very transparent about the problem, and it wasn't an issue with the 2021s. My son-in-law, who thankfully looks after me, hasn't sent me any more pictures from that dealer of C8s with issues and has told me since then he is looking forward to seeing mine when I take delivery later this summer.
Yes, Dealer insists its not a seal nor a crack but the fluid penetrating the casing when it gets warm and and is under pressure. I have pictures they took, but its difficult to see much
But if the dealer's diagnosis is correct, wouldn't that problem affect all C8s?
just realized one of the pics I had posted earlier of the old part # when the tranny was still in the car differs slightly from the paperwork by one digit. I figured one of you eagle eyes would catch that so I'm only the messenger. My paperwork must have a typo. Don't have a pic of the new part #
What is the location of this label? Would like to see what P/N have installed.
I checked my DCT and see only very slight indication of anything that looks anything like oil in the recessed area where this is being reported. Looks mostly like crud/trash there with a tiny bit of yellowish looking liquid, and I didn't see any oil on the pan below the DCT. At least the portion I was able to see using a borescope.
Date is wrong, didn't set it after replacing batteries in scope. I recorded a video too, which is uneventful.
If the yellow material is in fact DCT oil, it appears to be so little I will just consider it "normal" and would rather not have my car gutted.
What is the location of this label? Would like to see what P/N have installed.
I checked my DCT and see only very slight indication of anything that looks anything like oil in the recessed area where this is being reported. Looks mostly like crud/trash there with a tiny bit of yellowish looking liquid, and I didn't see any oil on the pan below the DCT. At least the portion I was able to see using a borescope.
Date is wrong, didn't set it after replacing batteries in scope. I recorded a video too, which is uneventful.
If the yellow material is in fact DCT oil, it appears to be so little I will just consider it "normal" and would rather not have my car gutted.
I do not know where that label is on the transmission since i did not take these pics. They were taken by the dealer while the car was up in the lift.
Unfortunately I did not take any pictures of the under belly of the car when I found it completely covered in oil. As the pictures above show, it left a line of oil down the driveway when I backed out to go to the dealership. I’m not sure how clearly they would have shown the amount of oil that completely covered the belly pan. But…. I can tell you that it was an “Oh ****” moment. There was no mistaking that it was leaking a lot of oil from somewhere. Since it was not red I thought it was engine oil. But the new DCT does not use the older style red transmission fluid. It was was unfortunate that the Corvette tech initially thought it was the transmission pan gasket and then the transmission pan itself. I lost three weeks with the misdiagnosis and waiting for parts.
The new transmission has been installed and hopefully the tech will complete the installation and testing later this week.
Unfortunately I did not take any pictures of the under belly of the car when I found it completely covered in oil. As the pictures above show, it left a line of oil down the driveway when I backed out to go to the dealership. I’m not sure how clearly they would have shown the amount of oil that completely covered the belly pan. But…. I can tell you that it was an “Oh ****” moment. There was no mistaking that it was leaking a lot of oil from somewhere. Since it was not red I thought it was engine oil. But the new DCT does not use the older style red transmission fluid. It was was unfortunate that the Corvette tech initially thought it was the transmission pan gasket and then the transmission pan itself. I lost three weeks with the misdiagnosis and waiting for parts.
The new transmission has been installed and hopefully the tech will complete the installation and testing later this week.
Good Luck, If its any consolation, I've got over 300 new miles on the new tranny (never quite know how to spell that word) and not a hint of a leak. Fingers crossed
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