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8 Speed shudder fix from GM

 
Old 03-08-2019, 10:59 PM
  #21  
Vetteman Jack
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I do not have the A8 in my car, but still interesting to read what the problems are and how GM is saying to solve the shudder.
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Old 03-08-2019, 11:16 PM
  #22  
Maxie2U
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Originally Posted by SgtMajUSMC View Post
Yes to the machine flush. Three times with 24 quarts total and the pan gets dropped and cleaned three times also. Car gets run in between flushes and shifted following the procedure laid out in the TSB.
24 quart flush and drop the pan three time? If true I will just like the frig’n thing fail and have them replace it under the extended warranty.
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Old 03-10-2019, 02:38 PM
  #23  
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I have a 2017 GS with A8. I had the shudder/washboard issue and during 2018 dealer performed the triple flush correction on two different occasions but neither corrected the issue. The dealer performed the latest flush with the new fluid last month, about 600 miles ago and so far, its been FANTASTIC! A completely different feel, smooth, no shudder or washboard feel. So far, this is the fix at least for my A8 issues
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Old 03-12-2019, 06:26 AM
  #24  
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I've taken 2 round trips to NC and back since my triple flush with the new stuff. it's running perfect!!!
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Old 03-12-2019, 10:06 PM
  #25  
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Had mine done today. Seems to have fixed the shudder and torque converter coming out of lock. They said on the invoice that the full problem resolution could take 200 miles of driving to complete. On my 20 mile trip home it never experienced the washboard effect or shudder. I'm hopeful as I've had this 2015 Z51 (15K miles) at the dealer more times than I want to think about! Shifts were smooth. Much different than before the flush and refill with the latest fluid.
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Old 03-13-2019, 09:01 PM
  #26  
Al Engel
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To the C7, A8 owners who have replied after the completion of this latest "fix" with the revised Mobil trany fluid; 'thank you' for relaying your experience and result. From your replies, it sounds like "So far, so good" for this aproaching to fix the problem. Keep your replies coming to see if this "fix" holds up.

Al Engel 'Save the Wave'
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Old 03-15-2019, 08:08 AM
  #27  
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Default A8 2019 c7

5,400 miles on the C7 I purchased in September. Going in for oil change and, unfortunately, the transmission flush Tuesday.
The threads have scared me to death about the A8 fix. Has anyone had the shudder problem and the flush fix it? Looking at options.
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Old 03-15-2019, 08:23 AM
  #28  
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I wonder if getting the tranny to 230+ degs, would burn off the moisture ?
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Old 03-15-2019, 11:01 AM
  #29  
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That's a good question. However, on the C6 it was recommended to keep the A6 below 230' (I think redline temp was 260) and so the cure might be worse than the disease. I'm not sure of the temp limits for the A8.

On our 2017 Z51 A8, I've never seen the tranny over 175' and even that took several consecutive autocross runs.
But your idea is still intriguing. Heating up the tranny every month or two could be a lot of fun.

Last edited by Gearhead Jim; 03-15-2019 at 11:02 AM.
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Old 03-15-2019, 11:31 AM
  #30  
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Originally Posted by Mgdr2525 View Post
5,400 miles on the C7 I purchased in September. Going in for oil change and, unfortunately, the transmission flush Tuesday.
The threads have scared me to death about the A8 fix. Has anyone had the shudder problem and the flush fix it? Looking at options.
So far, YES... I'm now at 700 miles after the new 2019 flush/fluid fix and its like driving a totally different car. No shudder, smooth shifts. Obviously time and more miles will tell but at this point..... all is well now.

Last edited by RWCARR; 03-15-2019 at 11:32 AM.
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