2018 transmission shudder, lucky me
10-06-2018, 03:51 PM
#81
Burning Brakes
Still haven't driven the 400 miles yet to complete the 'repair' to the triple flush, so we'll see after that if it's 'fixed'. Fingers crossed.
(2015 Z51 A8 shudder at 15,000 miles)
Last edited by mikez06; 10-06-2018 at 03:52 PM. Reason: Add deets
10-06-2018, 04:43 PM
#82
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St. Jude Donor '15-'16,'18
Hope he's correct. My dealer told me to drive 300 miles . Headed to Ocean City next weekend so that will do it.
10-06-2018, 05:42 PM
#83
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Just as the converter clutch slip is used to mask the additional vibration and harshness from operating a V8 as a V4 the new fluid is designed to mask the effects of utilizing a lockup clutch in a manner/duty cycle not originally intended. The problem could be addressed by either leaving the lockup clutch locked in AFM mode but then the vibration would be too noticeable to vehicle occupants OR just leave the clutch disengaged during AFM operation but then the very minimal mileage increase from V4 operation would probably turn into a mileage loss due to power lost in the open converter.
10-06-2018, 09:43 PM
#84
Drifting
Before my current car (‘17 GS A8,) I had a ‘16 Z06 M7 and a ‘15 Z51 M7. Personally, I never drove in ECO (AFM) mode because of the harsh V8 to V4 transition and vibration in the V4 mode. The A8 is much smoother with AFM activated. Because AFM is active in all modes with the A8 (other than in manual mode,) the driver would feel the transition from V8 to V4 mode and vibration associated with V4 operation. To avoid complaints, GM would have to program the A8 like the M7 I.e.: AFM active in ECO mode only. Because the A8 is approved with its current programming, GM would / will never go through the expense of re-certifying the A8. Which, of course, is how they should have programmed the A8 in the first place.
Last edited by Cosmo Kramer; 10-06-2018 at 09:48 PM.
10-07-2018, 02:42 AM
#85
Silly question, I know when I pull my car out of the garage it doesn't shift into 2nd gear right and then shifts hard when it does, but after that it is fine. What should I look for when you say the car shutter? Is it at a certain speed? Is it that noticeable and does it also happen when it is downshifting? I have a 2015 Z51 A8 with 17500 miles.
Last edited by Steve's98; 10-07-2018 at 02:43 AM.
10-07-2018, 03:15 AM
#86
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Silly question, I know when I pull my car out of the garage it doesn't shift into 2nd gear right and then shifts hard when it does, but after that it is fine. What should I look for when you say the car shutter? Is it at a certain speed? Is it that noticeable and does it also happen when it is downshifting? I have a 2015 Z51 A8 with 17500 miles.
http://www.corvetteactioncenter.com/...tate-1324.html
10-07-2018, 12:05 PM
#87
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2019 SILVERADO LEADS INDUSTRY WITH DYNAMIC FUEL MANAGEMENT
Excerpt from the article in link above: "Both transmissions feature enhancements designed to improve shift quality, as well as a new centrifugal pendulum absorber torque converter that reduces vibrations to improve smoothness, particularly during cylinder deactivation events."Apparently GM didn't test 2018 and earlier versions of A8 transmission thoroughly enough. New 10L80E receives the changes as well however no specific mention if these also apply to more robust 10L90E currently specific to 6th Gen ZL1.
10-07-2018, 01:10 PM
#88
Drifting
I wish I checked out the C7 forum before buying my 2019 Stingray with the A8. I was really excited about purchasing a new Vette this time around with the automatic transmission but after reading this thread I'm kicking myself now and would have gotten the manual transmission instead. I don't need the headaches associated with this transmission that everyone else is having here. I'm assuming it probably has not been corrected yet on the 2019 model. I'm certainly stuck with it now at this point with only 2 weeks of ownership and only 288 miles on it. If the shudder is still appearing after so many attempts to fix it at the dealership does this problem become a case for the Lemon Law? (I'm not sure if the Lemon law is just New York State or all states?)
Getting back to my problem of owning the car with the A8 it looks like my only option at this point while it is brand new would be to purchase the Range Module and hope that I won't put my torque converter clutch through the tap dance it goes through while in AFM mode and try to prevent the premature clutch wear of the converter. Would you agree? Has anyone had any problems because of the range module such as the MIL light coming on or any other issues as a result of plugging in the module?
Getting back to my problem of owning the car with the A8 it looks like my only option at this point while it is brand new would be to purchase the Range Module and hope that I won't put my torque converter clutch through the tap dance it goes through while in AFM mode and try to prevent the premature clutch wear of the converter. Would you agree? Has anyone had any problems because of the range module such as the MIL light coming on or any other issues as a result of plugging in the module?
10-07-2018, 01:47 PM
#89
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St. Jude Donor '15-'16,'18
The latest firmware (V8.6R1) in the Range can be plugged in and it will not cause any issues or deplete the battery. There were issues with earlier versions.
10-07-2018, 02:57 PM
#90
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Just for information: I just bought one on Amazon and it's the V8.6R1 version.
10-07-2018, 03:11 PM
#91
Burning Brakes
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I got one from Amazon first... It was obviously the older version because it possessed my car. I'd order straight from Range. It was actually a few dollars cheaper too!
Last edited by Sconn; 10-07-2018 at 03:12 PM.
10-07-2018, 03:36 PM
#92
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I guess the price changes but the one I just bought was cheaper from Amazon and was the latest software.
From Range = $199
From Amazon = $137.95 (Advance Automotive)
From Range = $199
From Amazon = $137.95 (Advance Automotive)
Last edited by Walt White Coupe; 10-07-2018 at 03:51 PM.
10-07-2018, 03:58 PM
#93
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I wish I checked out the C7 forum before buying my 2019 Stingray with the A8. I was really excited about purchasing a new Vette this time around with the automatic transmission but after reading this thread I'm kicking myself now and would have gotten the manual transmission instead. I don't need the headaches associated with this transmission that everyone else is having here. I'm assuming it probably has not been corrected yet on the 2019 model. I'm certainly stuck with it now at this point with only 2 weeks of ownership and only 288 miles on it. If the shudder is still appearing after so many attempts to fix it at the dealership does this problem become a case for the Lemon Law? (I'm not sure if the Lemon law is just New York State or all states?)
Getting back to my problem of owning the car with the A8 it looks like my only option at this point while it is brand new would be to purchase the Range Module and hope that I won't put my torque converter clutch through the tap dance it goes through while in AFM mode and try to prevent the premature clutch wear of the converter. Would you agree? Has anyone had any problems because of the range module such as the MIL light coming on or any other issues as a result of plugging in the module?
Getting back to my problem of owning the car with the A8 it looks like my only option at this point while it is brand new would be to purchase the Range Module and hope that I won't put my torque converter clutch through the tap dance it goes through while in AFM mode and try to prevent the premature clutch wear of the converter. Would you agree? Has anyone had any problems because of the range module such as the MIL light coming on or any other issues as a result of plugging in the module?
As an aside, I have 78,800 miles on my A8 and it is the best automatic I have ever driven. Never any issues with it. So in my opinion it would be at worst you would have one chance in twenty of getting a bad one.
If you should not feel any delayed engagement in shifting, no shuddering, only minuscule rpm fluctuation going from V8 to V4 if any at all. If you experience any of that you should take it in and have it examined by your dealer. It is not normal, nor acceptable.
10-07-2018, 05:32 PM
#94
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Transmission shudder
Just experienced this shudder on my 2015 c7 last week. I have 19,400 miles on the odometer. I have an appointment with John Megel Chevrolet in Dawsonville, ga. Tomorrow. I hope they can fix this problem!!!
10-08-2018, 09:41 AM
#97
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02-11-2020, 01:32 PM
#98
Have a look at this link below. It will explain all you need to know about the shudder.
http://www.corvetteactioncenter.com/...tate-1324.html
http://www.corvetteactioncenter.com/...tate-1324.html
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02-11-2020, 02:29 PM
#99
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Believe it or not,.. here''s the fix !!
For all those interested: Check this thread about Lubegard Transmission Fluid additive.
https://www.corvetteforum.com/forums...round-1-a.html
I posted numerous times in that thread about my results as things progressed adding Lubegard to my A8 transmission with excellent results.
And I'm not the only one.
There is a lot of DIY info/instructions etc and tools needed and it's easy all things considered.
Saved me a trip to the Dealer and I couldn't be happier with the results.
FYI: I have over 24,000 miles on my 2016 A8 and it always had a slight tug and pull sensation in V4 on the highway, but, I never experienced any shudder.
Recently, it would shudder once in a while shaking the Whole car under light throttle when going slow, .. something it never did before.
Just after it started doing that I found the thread linked above on Lubegard and below is my last 2 posts.
Please NOTE, before adding any Lubegard, I removed the same amount of Fluid that I was going to add before adding the Lubegard to it, to keep the Fluid level where is was originally.
Summary:
Added 2oz Lubegard Instant Shudder Fixx 29 + days ago and 10oz Lubegard Platinum a week later.
The shudder went away in the first 10-15 miles of driving and improved after adding 10oz Lubegard Platinum a week later.
Another 8 days later, I added another 10oz Lubegard Platinum to reach the equivalent of approximately 2oz of Lubegard Platinum additive per each quart in the transmission.
After driving 764 miles since day one of adding Lubegard, I'm very impressed with the improvement.
It's been running 97-98% Shudder free driving in Full Auto 100% of the time and if I'm not looking at the V4/V8 indicator, I can't tell when it it's V4 or V8 when driving fast or slow.
Last but no least, there is a Dramatic improvement in acceleration and also how Smooth and Strong the Transmission shifts now, and have to say it's a Night and Day Difference.
I would credit that to the Lubegard Platinum and recommend adding 20oz to the transmission regardless of whether it has a shudder or not.
Just my 2cents from my experience and I couldn't be more impressed with the Lubegard additive results
Also:
Since the Lubegard worked so good in my C7 A8, I put Lubegard 60902 Transmission Protectant 10oz in my 2007 GMC Envoy 4 speed Auto
It's like a new Transmission with Improved Performance and Smooth Strong shifts.
YMMV, but read the thread all the way through, you have nothing to lose.
https://www.corvetteforum.com/forums...round-1-a.html
I posted numerous times in that thread about my results as things progressed adding Lubegard to my A8 transmission with excellent results.
And I'm not the only one.
There is a lot of DIY info/instructions etc and tools needed and it's easy all things considered.
Saved me a trip to the Dealer and I couldn't be happier with the results.
FYI: I have over 24,000 miles on my 2016 A8 and it always had a slight tug and pull sensation in V4 on the highway, but, I never experienced any shudder.
Recently, it would shudder once in a while shaking the Whole car under light throttle when going slow, .. something it never did before.
Just after it started doing that I found the thread linked above on Lubegard and below is my last 2 posts.
Please NOTE, before adding any Lubegard, I removed the same amount of Fluid that I was going to add before adding the Lubegard to it, to keep the Fluid level where is was originally.
Summary:
Added 2oz Lubegard Instant Shudder Fixx 29 + days ago and 10oz Lubegard Platinum a week later.
The shudder went away in the first 10-15 miles of driving and improved after adding 10oz Lubegard Platinum a week later.
Another 8 days later, I added another 10oz Lubegard Platinum to reach the equivalent of approximately 2oz of Lubegard Platinum additive per each quart in the transmission.
After driving 764 miles since day one of adding Lubegard, I'm very impressed with the improvement.
It's been running 97-98% Shudder free driving in Full Auto 100% of the time and if I'm not looking at the V4/V8 indicator, I can't tell when it it's V4 or V8 when driving fast or slow.
Last but no least, there is a Dramatic improvement in acceleration and also how Smooth and Strong the Transmission shifts now, and have to say it's a Night and Day Difference.
I would credit that to the Lubegard Platinum and recommend adding 20oz to the transmission regardless of whether it has a shudder or not.
Just my 2cents from my experience and I couldn't be more impressed with the Lubegard additive results
Also:
Since the Lubegard worked so good in my C7 A8, I put Lubegard 60902 Transmission Protectant 10oz in my 2007 GMC Envoy 4 speed Auto
It's like a new Transmission with Improved Performance and Smooth Strong shifts.
YMMV, but read the thread all the way through, you have nothing to lose.