[KingLT1]

It isn't just a matter of the converter being a poor design. It's a combination of things.

1) The TCC slip tables allowing the converter to slip when locked for smoother transitions in and out of AFM mode are suspect.

2) The Converter doesn't like being locked in all gears under all conditions. Which is why the aftermarket converters will not lock until 4th gear.

3) The OE fluid retains moisture. This might be somewhat of a problem but I don't see it causing shudder if issues 1 & 2 are not present.

[classicrockr]

My car has a rumbling feeling when its between 1250-1450 RPM & I'm steady on the gas. Dealer said the picoscope didnt find anything.

[SmAC]

Well.... after trading my 2016 Camaro in for a 2019 Blazer with the 9 speed transmission I have found that the Blazer also exhibits the same shudder that the Camaro did. When I took it in for inspection the service advisor found a bulletin for the Blazer transmission. GM is blaming it on too much assembly lube in the fluid. ... GM needs to get this figured out. Looks like my Blazer will go back for the shudder a second time as the fluid flush did not fix the issue

[thinkingcamaro]

Had the shudder addressed this week (fluid only) and it’s like driving a different car. I now wonder how long it took me to realize there was an issue in the first place! Is it essentially confirmed that the transmission fluid replacement is only a temporary solution?

[Silverado57]

Originally Posted by thinkingcamaro

Had the shudder addressed this week (fluid only) and it’s like driving a different car. I now wonder how long it took me to realize there was an issue in the first place! Is it essentially confirmed that the transmission fluid replacement is only a temporary solution?

If I hadn't read about the shudder on this forum I may not have realized it was an issue. That being said, my dealer might have addressed it on a service visit.
I have about 7,000 miles on mine since the flush and it's good to go.

[arpad_m]

Originally Posted by SmAC

Well.... after trading my 2016 Camaro in for a 2019 Blazer with the 9 speed transmission I have found that the Blazer also exhibits the same shudder that the Camaro did. When I took it in for inspection the service advisor found a bulletin for the Blazer transmission. GM is blaming it on too much assembly lube in the fluid. ... GM needs to get this figured out. Looks like my Blazer will go back for the shudder a second time as the fluid flush did not fix the issue

Wikipedia: "According to an official report by the SAE (Society of Automotive Engineers) the design of the 10-speed gearbox is essentially all Ford, while GM was responsible for designing the 9-speed 9T transverse automatic gearbox. As part of their joint-venture, Ford will let GM use the 10-speed transmission with rights to modify and manufacture it for their own applications. In-exchange for Ford's 10-speed transmission, General Motors will let Ford use its 9-speed transmission for front-wheel drive applications; Ford ultimately declined use of the 9T."

[Haole]

Took my 2017 2SS in this morning for this issue. I had all 17 pages printed out for them. I verbatim quoted the symptoms I was experiencing noted on the first page. The service advisor informed me they need to verify my camaro was indeed covered and check for themselves. I said ok, 8 hours later I got a text telling me they just found the TSB I had researched. I had this printed and sitting on my passenger seat for them.
Long story short I will get it by the end of day tomorrow and was told it is covered with my warranty.

[cellsafemode]

Perm fixes:
New blue label fluid if you dont have the shudder and it was filled prior to q1 2019.
New blue label fluid if you have the beginnings of the shudder and dont drive much while it is happening.
New torque converter if you waited too long with the shudder and caused perm damage. (this likely wont be considered until new fluid is tried)

Water in the fluid makes it too slippery at low torque conditions and it begins to varnish and damage the converter during the shudders (the shudders cause not just friction damage due to sliding but localized boiling of the water due to the sliding). Low torque conditions are cruising at low engine loads. This happens to also be the same scenario that allows V4 mode, which is why people associate them. But you will get this even if you never enter V4 mode (like if you have been running a tune since 2016 that allows you to disable it). It's just a matter of time and environment when your Auto trans will exhibit if you're running pre-2019 or black label fluid.

[arpad_m]

^^^


@Haole, it's quite sad that it took them a day to find the TSB that you brought to them in the first place... let's hope they followed the procedure to the letter and your trans becomes shudderless .

[Haole]

Originally Posted by arpad_m

^^^


@Haole, it's quite sad that it took them a day to find the TSB that you brought to them in the first place... let's hope they followed the procedure to the letter and your trans becomes shudderless .

I agree, here is the text I received at 4:16pm (I dropped my car off at 7am)

Alright, looks like technician is doing the bulletin you found during your research. He only have one machine which is in use at this time. I would expect it completed around 1-3pm.

It took them 7 hours to look on my passenger seat i guess.
I just hope no more shudder.

[HCI2000SS]

The new fluid and flush procedure has been out for I guess roughly about a year and a half now. If this issue starts creeping its way back slowly and progressively in the near future we will know this was nothing more than a bandaid. If not then that's great, and I'll be very happy that GM stepped up and gave us a true and honest fix. My gut tells me otherwise to be honest. I really hope I'm wrong

[arpad_m]

Originally Posted by HCI2000SS

The new fluid and flush procedure has been out for I guess roughly about a year and a half now. If this issue starts creeping its way back slowly and progressively in the near future we will know this was nothing more than a bandaid. If not then that's great, and I'll be very happy that GM stepped up and gave us a true and honest fix. My gut tells me otherwise to be honest. I really hope I'm wrong

We're in the same boat, but this one is a 2017 and no indication that it would've been on the latest fluid. The many articles and the TSB makes sense from a technical point of view, and it worked for many, so let's hope GM were straight with this one.

[Haole]

Well my car is done. Going to pick it up in a bit. I was told though no heavy speeding for 200 miles, I live on an island so not a whole lot of areas to hammer it anyways right now. I'm fine with that as long as it is fixed.

Mahalo for all the input and posts on this thread.

[urirx98]

been having this issue for over 2.5 years, ive owned my 16 for 3 years, fluids been replaced twice( latest in 19), i have to bring it in early in week so they can look into it and hopefully replace torque converter) they need to give me a car which is my biggest problem since this is my daily driver.the plan is early next month