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The advisor told me to drive itv250 miles and it should go away. If it doesn't I guess the next step is a new TC. I will take it back Monday if its still shuddering.
 

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The advisor told me to drive itv250 miles and it should go away. If it doesn't I guess the next step is a new TC. I will take it back Monday if its still shuddering.
Why would you need the flush? I thought the 2020 and beyond come with the right trans fluid from the factory. I am confused...

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I did too. Didn't notice much of a difference. Also did the new coolant reservoir for the gurgles...Still gurgles sometimes. So idk...…..
 

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Also did the new coolant reservoir for the gurgles...Still gurgles sometimes. So idk...…..
I'll repeat what I asked someone else in another thread. Are you sure it's not just the A/C turning on? Sounds somewhat similar.
 

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I'll repeat what I asked someone else in another thread. Are you sure it's not just the A/C turning on? Sounds somewhat similar.
Nah its a gurgle. You hear when you hit the gas sometimes. Not very often any more..So kinda worked.
The sound is pretty obvious.
 

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Nah its a gurgle. You hear when you hit the gas sometimes. Not very often any more..So kinda worked.
The sound is pretty obvious.
The A/C may sound more like a babbling stream, and isn't dependent on hitting the gas.
 

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This is my concern. I'm very close to making a deal on a 2021, but if I get the shudder will ym treat me right?
 

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This is my concern. I'm very close to making a deal on a 2021, but if I get the shudder will ym treat me right?
I hate to say it, but there are a few reports of 20s having shudders. You can't trust what anyone from GM says about the use of new fluid. I would make a flush, and one you can witness, a condition of the sales close. Be TOUGH! They aren't married to these cars and they would rather have the sale. If you search the recent thread you will see the complaints. Print them out and present them to the sales creature. If he says this doesn't mean $hit, the ask if his dealer's google reviews mean $hit?
 
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I actually have my 2020 in at the dealership to have this looked at. I bought it back in February of this year and noticed the shuddering at around 7k miles. I've only just now got around to bringing up the issue with the dealer at 15k miles. If I would have known back then it was still going to be problem with the 2020s, I might have bought a Taco or a Gladiator instead.
 

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I had a 2017 with shudder, my 18, 19 and now my 20 do not have it.
 

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My '18 started doing it this year. Got the TSB flush performed. Good as new again. I wouldn't call this a reason to avoid the truck, just something to pay attention to.

If you look around, there's reports of shudders in other new automatic transmissions, not just GM.
 

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My '18 started doing it this year. Got the TSB flush performed. Good as new again. I wouldn't call this a reason to avoid the truck, just something to pay attention to.

If you look around, there's reports of shudders in other new automatic transmissions, not just GM.
Oh, I agree. I love the truck but its just a bummer that its still on a problem on the 2020s. I did the research before I bought it earlier this year - hoping that it was addressed.
 

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My ’17 just started it at 65,000 miles. If it happens, hope it happens under original power train warranty. Out of pocket cost is $$. Extended warranty does not cover fluids. 😡 But not a single blip since fluid change, so I can’t complain. My truck has been great!
 

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These 8 speeds have been doing this since 17 when they came out. So this crap isn't sorted out yet? How can a 2020 have the wrong fluid? WTF?
 

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These 8 speeds have been doing this since 17 when they came out. So this crap isn't sorted out yet? How can a 2020 have the wrong fluid? WTF?
It may also be that the new fluid does not fix the issue, but rather in most cases delays the issue from surfacing till later and maybe in some cases the delay does not happen. Just a thought.

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I own q 2019 Traverse with a 9 speed auto and there is a guy on the forum that is a tranny specialist and he showed us how to change the ATF with pictures. If you can change your own motor oil you can change the ATF. Not sure if the 9 speed in the Colorado is the same as in the Traverse, but if they are I would recommend the ATF change. No flush... After changing my ATF, I my shifts are smooth as butter. I have over 28K miles and no shudder or weird issues. Owners that did experience the shudder did not after changing the ATF. I plan to change the ATF next week, as it's been 7K miles and 2 vacation trips each over 1,400 miles. Since it's easy and cheap preventative maintenance - why not.

Again, I do not know if they are same 9 speed autos...

I also have an 09 Colorado v8 4x4 and a 99 Camaro SS modded and wished it was this easy too. 4L60E PITA to work on with parts in the way.
 

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It may also be that the new fluid does not fix the issue, but rather in most cases delays the issue from surfacing till later and maybe in some cases the delay does not happen. Just a thought.

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Yes, that's my point, they did a flush on a 2020 to fix it. This makes zero sense. I have a funny feeling my next truck won't be made by GM.
 

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Yes, that's my point, they did a flush on a 2020 to fix it. This makes zero sense. I have a funny feeling my next truck won't be made by GM.
Interesting how manufacturers had fairly bullet proof 5, 6, 7 speed transmissions. But 8, 9, 10 seem to have issues. 10 seems like alot of gears, but 8 seems like a sweet spot if they can get the issues worded out.

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