iclick

I suspect that only a few select people at GM know the answers, and they'll never let the word out. Propagation of info on a major engineering flaw like this one is something they want suppressed, I'm sure.

Heidemarie

Wow; how confusing. Sounds like GM had more than one experimental TC and was still testing these when the first A8s came off the line in 2014. This TC issue definitely needs to be monitored. Our TC in the previous vette (2015 Z51) was replaced at 8886 miles in April 16 but we traded car in on our '17GS in Oct.16 when car had 12K miles (not enough miles on replacement TC to show problems). So far our GS is flawless but only has 2K miles. Time will tell. We drive in auto mode most of the time.
Heidi Save the Wave

rmorin1249

My TC and stator support was replaced on 8/30/16 at 7500 miles. I don't know what the part number of the old TC was but the new one is:
24279495. Have about 2K miles on the new one and so far so good.

djnice

Just curious. Did you verify your buddy's car was going into V4 mode?

767guy

Yes, I checked that several times with the DIC displaying the V8/V4 icon as I wanted to see if his car makes the "ch" or "sh" sound momentarily when it switches from V8 to V4.. There is already a thread about that noise and my car does make that noise.

jerrsvette

Similar question as vette nv;

Would a car invoiced (built ?) in Dec 2016 , vin ending in ...134XX , have the most recent torque converter update?

2fastnow

Ford was smart to go M6 only in their GT500's plus they don't have the transmission capacity (larger) ones for this kind of torque. Ford uses GM tranny's in their V10 trucks (Allison's).
But stubborn GM want's all the market share so they will succeed at getting it right for now and later on these big motor designs.

iclick

I don't think anyone outside GM knows that, but I think would be very close. Keep your fingers crossed. If your car was invoiced in Dec. I would think it was built later, perhaps in Jan., and that would get you even closer to the cutoff date. Just speculating here.

iclick

I'd like to give a hopefully final report on my TC maladies. Got the car back yesterday, no shudder on the way home but no highway driving. Today I took a test ride and can report no shudder or tach oscillation in V4 mode. Verdict: Success, for the time being anyway.

I did notice that when I drop it to M at cruise and it moves from V4 to V8 the tach drops about 50 rpm, but that may be normal. Anyone else notice this?

See below the relevant portion of the receipt. It looks like they purged the old fluid, installed new, purged again, then a final install of fluid. PIP5337E specifies Dexron®HP Fluid (19331925, 19331926 in Canada), but my receipt refers to PIP5337H, which I can't find on-line without paying for it, and the fluid is now 19353429. Thus, I think we have yet another revision scenario here. I'm getting to really love these revision changes and look forward to each and every one, don't you? The latter number is higher, so I assume they've revised the earlier fluid. Are there any accountants in the group who would volunteer to keep up with all this?

Since I like this car so much I may put off my decision to buy a new car with M7. Since I'm miffed at GM (not the Corvette itself) I was even thinking about moving to a Porsche Cayman, so I may be slowly going insane, folks. Not putting the Cayman down with that remark, just my eradic behavior that's steeped in frustration.

djnice

Does it drive any different other than the shudder? Shift the same, etc.?

iclick

I didn't mention it, but it seemed that shifting was more crisp, especially the first cold 1-2 shift, which before the swap was always rather sloppy. I'd better give more time to assess this properly, though. I don't know what the TC would have to do with that, but the revised fluid might change shifting behavior. I have no complaints after my test drive this AM.]

Edit: After another long drive today I don't think the shifting is any different, but my A8 always did perform very well. First 1-2 cold shift is not as sloppy, IMO, and now feels normal--but two tries is insufficient evidence. Performance was never an issue for me with this tranny.

2fastnow

The key is how long will it last.

iclick

That's my worry, but I have three years left in my warranty and have apparently found a dealer who can do the job. So, it would be a matter of driving to the dealer (10 miles), waiting two days, then coming back to pick it up. Not a big hassle, but I still don't like techs doing major surgery of that sort. I got one small scratch on my rear fascia from this last ordeal, but touched it up where you can't see it without getting on hands and knees and squinting.

What's more, after the drive train warranty expires, who wants to have an A8 without an extended warranty? Not me, and that will probably be the time to trade.

2fastnow

Maybe by then or sooner we will hear good things on the better TC replacement so no need to pre worry.

iclick

I'm trying to absorb some of your optimism, but memories of the past are putting up a resistance.

VLADIE22

I picked up my car this morning with a new TC installed . The repair invoice said part #24280631 . So far , so good. We shall see if the problem is fixed...

FloridaZ51

KrikGS, is Stingray Chevrolet still your servicing dealership? Also is the same tranny Tech fixing these issues? I am starting to have symptoms of a failing TC (shuddering) and was curious to know who I should ask for when I drop the vette off.

2016 Stingray Z51

blue max

No pretending here I love my Laguna blue which is very popular and looks good inside or outside Just Sayin Have a great day

Thunder22

Sorry to resurrect an old thread but 2 related questions:

1) For those who had the new at the time TC part installed, is the car still operating without any issues?

2) Is the TC replacement covered under the 60k powertrain warranty?

Internets_Ninja

A good tech could do it in 5 hours for sure. But that is really ripping through it. Also, there is a possibility they just did the triple fluid flush and showed you a converter from another job.

When I had A8 issues in my 2017 Camaro SS Fifty, the triple flush and TCM flash solved the issue. The tech said the cars that exhibit the shudder and are brought in immediately can usually be solved with the triple flush and TCM update. But those that allow the shudder to persist end up damaging the torque converters and that is why they have to replace them.