A8 shudder fix
Thread Starter
Race Director
Joined: Oct 2000
Posts: 14,060
Likes: 1,165
From: N. Alabama
Thread Starter
Race Director
Joined: Oct 2000
Posts: 14,060
Likes: 1,165
From: N. Alabama
https://www.corvetteforum.com/forums...udder-fix.html
Last edited by SouthernSon; Sep 22, 2019 at 12:20 PM.
Melting Slicks
Joined: Dec 2004
Posts: 3,382
Likes: 250
I have taken my ZR1 to the track three times this year and will many more after I get this new flush done this week.l
Race Director
Joined: Oct 2008
Posts: 16,610
Likes: 7,693
From: NJ
The shudder is an annoyance. And evidenced by a ZR1 having it.... is not an effect of the afm system (v8 v8 switch)...
It's moisture in the fluid. The older fluids (prior Jan 2019 and feb 19 on the line) the fluid begins to absorb moisture and that doesn't work well for friction.. screws up the surface of the tcc..
As mentioned above some tcc are too far gone. Others have problem with desler techs that are not up to speed (how that could be but we have heard some horror stories here haven't we?).
It's moisture in the fluid. The older fluids (prior Jan 2019 and feb 19 on the line) the fluid begins to absorb moisture and that doesn't work well for friction.. screws up the surface of the tcc..
As mentioned above some tcc are too far gone. Others have problem with desler techs that are not up to speed (how that could be but we have heard some horror stories here haven't we?).
Pro
Joined: Aug 2018
Posts: 652
Likes: 156
From: Clarksville, TN
Shudder on a zr1? Well then, maybe my suspicions are true that v4 mode isn't totally to blame. Taking mine back in today after not having any luck with the new fluid. I'm not expecting much from this trip and if its not resolved this time some upgrades will be coming.
Race Director
Joined: Nov 2005
Posts: 14,548
Likes: 1,539
From: Supporting the Corvette Community at Abel Chevrolet in Rio Vista, CA 707-374-6317 Ext.123
St. Jude Donor '08
Melting Slicks
Joined: Jun 2013
Posts: 2,598
Likes: 1,593
2016 Z51 A8, have tracked this car at least 6 times, and drive it like a human being on the road... 16K total miles... had the judder a few months ago, the dealer did the trans flush under the service bulletin, no charge, car drives fine now... so at least for me, it was a textbook case, and solved by the recommended service.
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Thread Starter
Race Director
Joined: Oct 2000
Posts: 14,060
Likes: 1,165
From: N. Alabama
It is truly a strange frequency of resonance. One can imagine a carbon fiber driveshaft unraveling and slapping against the tunnel. whether the moisture laden fluid is benign or deleterious to the longevity of the tranny who knows? When driven in anger on the track it is probably lost in the cacophony of noise. It is very noticeable at 70 mph on the highway.
3rd Gear
Joined: Sep 2019
Posts: 3
Likes: 0
Started getting the shutter in my 2018 GS at about 900 miles. Took to dealer and they performed flush. Got it back to the house and noticed a "puddle" of transmission fluid under the car. Dealer picked up Monday and indicated that the transmission plug was leaking and replaced gasket. They then took it for a test drive and engine began to run hot and making noise. Had to tow back to the dealer. Now there are telling me it could be camshaft bearing or another bearing in the engine. Also possibly a lifter spring or lifter. Vette has 1,750 miles on the odometer. Wow.
Thread Starter
Race Director
Joined: Oct 2000
Posts: 14,060
Likes: 1,165
From: N. Alabama
Started getting the shutter in my 2018 GS at about 900 miles. Took to dealer and they performed flush. Got it back to the house and noticed a "puddle" of transmission fluid under the car. Dealer picked up Monday and indicated that the transmission plug was leaking and replaced gasket. They then took it for a test drive and engine began to run hot and making noise. Had to tow back to the dealer. Now there are telling me it could be camshaft bearing or another bearing in the engine. Also possibly a lifter spring or lifter. Vette has 1,750 miles on the odometer. Wow.
Melting Slicks
Joined: Nov 2002
Posts: 2,884
Likes: 260
From: Jamison Pa
St. Jude Donor '11-'25
I just dropped my ‘16 off at Bryner Checvrolet to have the shudder fixed. My ‘17 Yukon Denali suffered from the same issue. My GMC dealership addressed the trans fluid issue and it’s been fine for 2k miles.
Advanced
Joined: Apr 2019
Posts: 77
Likes: 48
From: North Carolina
Shudder noises
My 2016 had several strange noises. After the 3 time transmission flush, that fixed 2 of the noises but I still had a "shudder" noise when only in V4. After reading some posts and taking my service guy for a ride....they came up with Bulletin #15-NA-040 for Belt Tensioner Issues. They replaced the Belt Tensioner and so far it has fixed the V4 mode noise.
Le Mans Master
Joined: Oct 2014
Posts: 8,672
Likes: 2,726
From: Atlanta GA
Yes the ZO6 suffers from shudder and does not have AFM but ... the LT1 with AFM suffers from more instances of shudder because of AFM , when in 4 cylinder mode , the TCM uses a different programming which increases the pulsing/slip or the TC clutch. much more than when it is in V8 mode . This is the reason why most folks have success after installing a RANGE device, as long as the clutch is not completely trashed , if held in V8 mode you wont feel any shudder
I am not believing the hydroscopic BS , they have been making trans fluid for years and now all of a sudden we have trans fluid that is hydroscopic ...???? Right.........
44,000 miles on my LT1 15 with a range , raced hard and driven almost daily , got the shudder early and instantly bought a range. Been working perfect ever since
Dave
I am not believing the hydroscopic BS , they have been making trans fluid for years and now all of a sudden we have trans fluid that is hydroscopic ...???? Right.........
44,000 miles on my LT1 15 with a range , raced hard and driven almost daily , got the shudder early and instantly bought a range. Been working perfect ever since
Dave
