Bird67

Reading reports of DCT problems is unnerving. Magic Glass isn't wrong - there is an apparent DCT issue, and it shouldn't be happening. Nor is Phil wrong - it's not realistic to expect that execution of a clean-sheet design by any manufacturer can be flawless. The litmus test is how the manufacturer responds to and addresses issues when they become apparent. GM's responsiveness can't be assessed fully because its response is so clearly hampered by supply chain issues.

NextOne

@Rollnthunder How did you come to find you had a problem? Leak on the garage floor? Any trouble getting the parts? Thanks!

Vetteman Jack

Phil - hope the oily residue is from a minor issue and can be quickly remedied by the dealer. If just a gasket replacement that would be great.

Paws

Your delivery is FILLED WITH VITRIOL !!

Move to another brand if you're SO UNHAPPY and filled with disgust !!

I for one CAN'T stand your method of expression.

pcguy2u

Fixed it for ya... And you are definitely successful at being cynical. The real question is "why don't you ever answer the questions that folks raise about why you are still here and still buying Corvettes (if we can believe you)???

DebRedZR1

Do not feed the .The report button works well !

Phil1098

The mileage on my car is just shy of 4,400 miles. I have not changed the DCT filter (I have one in the box, but haven't opened it yet) or touched the DCT. I suspect this has been leaking from the start since I had the oily residue on the pan one year ago at 1,850 miles when I did the engine oil change prior to putting it away for the winter. It has not been to any shop or dealer since I have owned the car so no one has removed the shear plate (just me, twice now).

So I kind of have an update. I stopped by the the dealer and there is no updated or superseded pan or gasket for the 2020 and first half of 2021 cars. I also verified they have changed the entire transmission case and there are more bolts on the new design pan so it won't fit the older versions like mine. Since mine is going into the garage for the winter very soon, I am not doing anything with it until at least spring. Maybe by then they will have a new design gasket for the older cars. My logic is, why would I replace the gasket with another identical gasket just to wait for it to leak too. In my mind, that's a strong possibility because Tremec has gone so far as to redesign the case and pan assembly, they wouldn't go through that expense for no reason. It isn't and never has hemorrhaged fluid, just kind off makes a mess so I have zero fear of driving the car. I posted this with pics for those that have a 2020 and an early 2021 so they could be aware and look for the possibility of this happening. I still love my car.

Broken Halo

Phil, did the dealer give you an approximated crossover point from old to new, build month wise? Mine was built the first week of July and if I can avoid jacking it up and pulling the shields just to get a look at the pan that would be great!

Phil1098

They didn't, for the 2021 model year the parts screen just listed pan and gasket as "with reinforcement" or "without reinforcement" The reinforcement is on the old pan, kind of like the little steel plate they used to have on stamped steel valve covers to distribute the load of the bolt more evenly. You may be able to remove the drivers side rear wheel and get enough of a view to see if it is a steel pan (old) or a cast aluminum pan (new style). Would be a ton easier than removing over 30 bolts and two belly pans to see it.

MikeyTX

https://www.autoblog.com/2021/11/01/...mission-leaks/ Very interesting read on the issue.

Phil1098

Possibly to the surprise of some (me included) my local dealer has the pan gasket in stock, but as I said, since it's the old design I won't be having it replaced until spring. I look at it this way, I get a $500+ worth of new free DCT fluid when they do replace replace the pan gasket, that doesn't seem so bad.

Racer X

Perhaps the transmission is just weeping from being driven so little. Maybe you should drive it a lot more. It may still be weeping, but at least it would be tears of joy!

Sorry to hear of the problem. I may try to get a camera up in there. I have been thinking about getting one of those snake cameras that attaches to your phone. This may be a good excuse to get one.

Phil1098

That's the problem with having a company car, the C8 is just a toy that sits in the garage. I really do drive it as often as I can, once I retire I will have loads more time to put miles on it. BTW, a friend of mine has one that is only a few hundred away VIN wise and and his is leaking too, about the same amount overall, nothing on the ground either. It just shows why they changed the design.

RKCRLR

We don't know why they changed the pan design. The original pan and gasket design may work fine if properly installed. Perhaps they changed the case design to address the porosity issue and the pan design was changed along with it. Or perhaps they changed the case design as part of the accommodation of higher RPMs in the upcoming Z06 and wanted to have a common case.
It will be interesting to see how GM addresses the issue in the future.

JVi

Took a look at the first picture in the link; it looked familiar. Sure enough, I've been there.
Best road to see Mt. St. Helens from without the crowds.

john91498

ah, geez, that looks familiar...hope you can get it fixed, Phil

C5 Hardtop

I would have left the mess so there is plenty of evidence. Some mechanics can have a problem when there isn't a code or something slapping them in the face to tell them where the problem is.

Phil1098

I did, this is from the original post. "I wiped off the belly pan but left the mess on the DCT, this one is on the dealer to see if they agree where it's coming from."

JDSC8VETTE

Wow magic I thought we wouldn’t have to read your negativity until your new car came in. I guess you couldn’t control yourself that long.

Chevy Performance

Yep, this is absolute nonsense with what is going on.