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Old 02-17-2023, 01:06 PM   #1
majdmajd
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Exclamation Transmission Shudder Fix?

Does anyone know how to fix the Automatic Shudder problem with the 8 speed?

I already changed the fluid before and now its back again, is it a valve problem?
Do i have to flush it again?

If so, can anyone give me the exact Fluid capacity it takes,

Thanks alot
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Old 02-19-2023, 07:07 AM   #2
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There are many threads on this.
Fixing the problem requires changing the fluid before there is too much wear on the clutches within the torque converter. Once they are too worn, you will need a new torque converter and the fluid changes will not help.
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Old 02-25-2023, 10:36 AM   #3
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Thanks for the heads up lol
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Old 02-26-2023, 10:42 AM   #4
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Quote:
Originally Posted by ctrlz View Post
There are many threads on this.
Fixing the problem requires changing the fluid before there is too much wear on the clutches within the torque converter. Once they are too worn, you will need a new torque converter and the fluid changes will not help.
Will a factory torque convertor be good enough? It was the wrong fluid, not the design of the original convertor, correct?
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Old 02-26-2023, 11:39 AM   #5
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Originally Posted by classicrockr View Post
Will a factory torque convertor be good enough? It was the wrong fluid, not the design of the original convertor, correct?
Yes, it is not the converter itself causing the problem. Wrong fluid caused premature wear of the clutches within the converter. The old fluid attracted water, and it's a case of the old "oil and water don't mix" problem.
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Old 03-18-2023, 07:20 AM   #6
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How long is too long, I just, got this car and it has 56,000 kms / 35,000 miles
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Old 03-18-2023, 07:46 AM   #7
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Originally Posted by ironfang View Post
How long is too long, I just, got this car and it has 56,000 kms / 35,000 miles
We're no clairvoyants here unfortunately, did you check the car's service history?

If this Camaro went 35k miles on the original converter and fluid, it's way overdue for the flush. In that case, check for the presence of even a hint of a shudder for peace of mind, but even if there is none, take the car in for a transmission flush as per technical service bulletin 18-NA-355. You should be able to recreate the shudder (not really a sound per se but a vibration experience similar to driving over rumble strips along lane dividers) the most easily by driving under low load conditions, 45-50 mph in 8th gear, on a level or slightly uphill road for at least half a mile or so.

If the service department refuses to perform this (the TSB does say it isn't applicable in Canada), go for 19-NA-018, its Canadian counterpart—although I will say that it seems to be an old version of 18-NA-355 and still prescribes a triple flush and mandatory picoscope verification, so at least make absolutely sure they use the correct fluid introduced in Jan 2019, which is Mobil 1 Synthetic LV ATF HP with the blue label (part number 19417577), see picture below. The part number may differ for Canada, but the fluid must be the same, otherwise the shudder will return and eventually take out the torque converter clutch, as ctrlz alluded to above (GM took multiple attempts at fixing the problem, so several previous fluid versions exist).
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Old 03-18-2023, 10:16 AM   #8
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It definitely has the shudder, I feel it often.

Are these TSBs supposed to be free, the car is out of factory warranty, so I was just going to change fluid myself.

I did get an aftermarket warranty but it will not cover any of this I’m sure.
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Old 03-18-2023, 03:48 PM   #9
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Quote:
Originally Posted by ironfang View Post
It definitely has the shudder, I feel it often.

Are these TSBs supposed to be free, the car is out of factory warranty, so I was just going to change fluid myself.

I did get an aftermarket warranty but it will not cover any of this I’m sure.
TSBs are free under powertrain warranty, once that expires, you're on your own. Well, technically you might argue a preexisting condition, but I'm not sure you'll get very far with that, since you just bought the car... you might have a case if there are previous service records that indicate an attempt at fixing the problem.

The shudder may have advanced to a point where the TC clutch is too worn, but that's impossible to tell without pulling the transmission. I would probably request a new torque converter (and obviously the new fluid) to make sure the shudder does not return.
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Old 04-12-2023, 05:45 PM   #10
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As others have said fixing the shudder requires changing your transmission fluid to the new one with the limited slip additive. If your tranny has been shaking for a while it's possible that you might need a clutch replacement
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Old 06-19-2023, 06:14 AM   #11
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I just got my 2023 2.0L with 8-speed transmission. Car was built in May 2023 I believe. Do I have the incorrect transmission fluid in mine? Mine car has under 1,000 miles on it.
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Old 06-19-2023, 06:57 AM   #12
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Quote:
Originally Posted by Shock and Steel View Post
I just got my 2023 2.0L with 8-speed transmission. Car was built in May 2023 I believe. Do I have the incorrect transmission fluid in mine? Mine car has under 1,000 miles on it.
The correct fluid came out at the end of January 2019 and was widely available by March 2019, so you should be good.
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JMS PowerMAX | DSX flex fuel kit | Roto-Fab CAI | Soler 95mm LT5 TB | 1LE wheels | 1LE brakes | BMR rear cradle lockout | JRE custom tune

1100 - 1/30/18 | 2000 - 1/31/18
3000 - 2/06/18 TPW 2/26/18
3400 - 2/19/18 | 3800 - 2/26/18
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Old 06-19-2023, 08:59 AM   #13
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Quote:
Originally Posted by arpad_m View Post
The correct fluid came out at the end of January 2019 and was widely available by March 2019, so you should be good.

Thank you very much for the information.
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Old 06-19-2023, 11:53 AM   #14
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Quote:
Originally Posted by Giri View Post
As others have said fixing the shudder requires changing your transmission fluid to the new one with the limited slip additive.
This is the most specific info I can find on exactly why this fluid caused trouble. The original (problem) fluid was dexron VI. This copied over from a Jan 2019 post at Bobistheoilguy:

According to GM, the problem was the fluid being hygroscopic, so much so that the fluid would not give up the water even when hot. The accumulated water in the fluid affected the friction of the fluid and created the shudder especially when the engine was operating in V4 mode which has built in TCC slip of around 10 rpm to reduce felt engine vibration in V4. Unfortunately the wet fluid created the shudder. The new fluid is supposed to fix the issue. The TSB 18-NA-355 is new as is the fluid and change procedure which varies depending on the vehicle. Initially the fluid is in short supply, and is being rationed to areas of the country that had the most problem. Humid states in the South and South East.
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