freddieg

Dealer did the flush, my shuddering and shifting issues seem fine for now.I also asked them to check my rotors. Ended up with new rotors all 4 wheels per the bulletin.

CTPJ

Purchased a 2015 Z51(3/15 build) with an A8 transmission in November. It had 2,900 mile and had been babied by the PO, an older gentleman. The first thing we did was install a Range device. Other than the test drive and the first couple of days, we have never had it V4 mode - and never plan to. Here's my question, since the TC is a known issue in '15's, should we drive it without the Range installed to see if the TC fails so we can get a flush and/or upgraded TC or continue to drive it with the Range unit and not worry about the upgraded trans fluid or the updated TC. This is my wife's nice weather daily driver. She plans on doing some track events with it, as well, and keeping it for a long time.

Thanks,

Todd

GaryPitts

I would. It almost certainly needs the new fluid. Get it, make sure no more shudder, and put the Range back in.

PegasusCapital

If it ain't broke don't fix it! The 2015s came with a 5yr/50,000 mile powertrain warranty. So you've got plenty of protection remaining if anything should go wrong.

As long as you keep AFM deactivated you should be fine.

skynest

I agree with you. I have had the little burble in the car for about 6 to 9 months. Don't drive it much: 2015 Stingray, 5000 miles. Until yesterday I thought I would just use Diablo or Range to take care of it. At first it sounded like the road. Until yesterday. Pulled out from a stop sign and got to steady at 35 and shudder shudder. Noticed too on the way home 300 up (then steady) and 300 down rpm (then steady) with very little input from me. Just a speed adjustment. I know if I let this go it will damage drive train. Called Stingray in Plant City. Told them I thought I had a torque converter problem. They said bring it in. They have a veritable line of cars to repair. Have a guy dedicated to it. He said they would either flush or replace components depending on what they find. Not a small job, must pull the trans to do the procedure. Offered me a loaner and gave me a two or three day turn around.

I considered just defeating AFM, but my co-owner (wife) said what if we want to sell and the buyer wants to use the AFM. Well, of course it won't be good, so flush then defeat AFM. The main problem with letting someone work on your pride and joy is they sometimes aren't qualified or good enough to do it. I must say that Chevy really messed up here because who has to repair a transmission after so few miles.

And for me especially since I have rarely pushed the car and generally just drive normally to have this fail is astonishing. I believe that this problem would have occurred anyway sometime down the road even if I had all 8 going all the time. Just an opinion. Good luck to all on this.

skynest

On the way out to the dealer I drove manual paddles. Haven't done much of this, but I was surprised at how easy it is when you set your mind to it. The car drove like a dream in manual. In fact, I don't think I would ever use 8th gear. Went to auto on the expressway and told my wife to count seconds between rumblings. We could not even get 5 seconds between the rumbles in the transmission. We knew right then that we had waited too long for this repair.
The repair rep was good, both of them. Got a call today saying that the torque converter has been replaced and will be ready tomorrow. He said that the decision on what to do depends on my build date and state of the problem. So, they do have to check with GM. Hoping for the best.
All under warranty. Thank you GM. (100,000 miles or 5 years I believe on power train).

Ced4jets

They replaced the TC in my 17GS about a month ago and there was an immediate improvement which has continued to get better over a few hundred miles. Installed the Range immediately after the repair. My new TC has never seen 4 cylinder operation.....Very happy with my "new" car.

ROBWILKER

Actually I believe my '15 Z06 has a 5 yr. 100,000 mile powertrain warranty. The '16-'19 models should have a 5 yr. 60,000 mile powertrain warranty.

Flo

I brought my GS to my dealership in Norfolk for a diagnosis.
One of their Corvette specialist came with me for a 20mn test drive and he quickly felt the shudders and saw the lightly RPM variations. He was not very surprised, others Corvettes are concerned. But, he thinks it's only the beginning of the issue and it can be fixed by the fluid replacement.
So, I schedule it in 10 days. Hope it will be enough.

jivor

I had the triple flush under warranty around 6K miles. Recently, 2 months ago around 15K, I was driving on cruise control around 68mph, and the car started an oscillating shudder (accompanied by 100rpm fluctuations) every 5 seconds or so. I switched to manual mode and it stopped; after about 30 miles, it stopped hiccuping in auto mode. No problems until 2K later on another road trip, and a brief 5 minute run of oscillations. Nothing now. Research continues...

skynest

We picked up the car 4 days later and damn!, it drives like new again. Have about 300 miles on it about half auto, half manual since repair and it is still great. This is the feeling I paid so much hard earned money to get. Thanks Bill, Jay (service mgr.), tech who worked on the car and Stingray Chevrolet! GM and Chevrolet too, thanks.

PegasusCapital

That's good news. Just make sure you get and install a Range Technology unit so you don't have problems again going forward.

jim spitzer

I had the triple flush done in Dec. The car was a lot better. The dealer told me to drive it for 200 miles to see if that fixed the problem, That worked for about 3k miles. Stopped at the dealer this morning and told then about the problem the dealer set it up for a new TC for Tues. morning.My car is a 2017 vert 2lt with 14,333 miles. Build date sept 2016

arturobandini

KCV

Walter Raulerson

[QUOTE=PegasusCapital;1596831655]If it ain't broke don't fix it! The 2015s came with a 5yr/50,000 mile powertrain warranty. So you've got plenty of protection remaining if anything should go wrong.

As long as you keep AFM deactivated you should be fine.[/QU

5 yr 100,000 mile powertrain warranty on '15s

kennyjames21

It's the stupid AFM that is at fault from what I've read, when the car goes into V4 mode it creates nasty vibrations (the corvette lead designer even notes in many videos how they went with a steel driveshaft/torque tube to handle the vibration) that mess up the torque converter and rear end on some of these cars. The manuals seem to have far less issues because they go into V4 mode far less often. Maybe some of the forum engineers can correct me if I'm wrong on this.

KCV

Jay_Davis

They can't. At this point I'm so sick of GM and how they've behaved lately, but legally they can't offer such a thing because it would invalidate their mileage testing. What they need to do is fix the A8 or replace it. But they won't because they just don't care until lawyers get involved.

markmo

This is exactly the question I have been asking myself. My vette has around 5000 miles on it and had just begun to shudder sometime last Fall. I had the transmission flushed just before I put it away for the Winter. Although I still have not driven it since the flush, I did order a range device recently (and a switch). After reading some of the very articulate responses in this thread, particularly by member NSC5, I am inclined to run my car without the range until I am eligible for a new TC. I have read too many reports by owners who have had recurring problems with their TC after the initial flush, especially those with the same build date as mine.