![]() There are a few proven brands that correct it all AND increase acceleration substantially, but if the symptoms have been present for any length of time, wear and damage very likely has already started. In January 2019, GM issued TSB 18-NA-355 entitled, Shake and/or Shudder During Light Throttle Acceleration Between 25 and 80 MPH (40 and 128 KM/H) at Steady Speed. GM does not want the expense of replacing the torque converters so very few are able to get this under warranty, and it is just the same design they replace it with, again NOT addressing the cause, only the symptoms. ![]() ONLY a good proper designed aftermarket converter can correct the cause. The shudder is from the fluid aerating and then it cannot provide the clamping pressure for the clutches and steels, and the metal HCI2000SS found is from the damaged caused by the shudder, and all will have this damage depending on how long the shudder was present. The flush is only a bandaid intended to get you past the warranty period, and then it is no longer a liability to the auto maker. The symptom is from the stock converters poor design. The GM part number for the correct fluid is 19417577 for bottles and 19417904 in 55GL drums. August, 2019 Bulletin No. Now, on the shudder issue and the fluid flushes. Tsb (Technical Service Bulletin) 18-Na-355 These plaques primarily consist of the A isoform, and it interferes with neighbouring synapses to induce tau aggregation in neurons by unknown mechanisms, which causes neuronal damage. Make sure your dealership verifies the two versions of the ATF fluid because they both have the same name but the first one I listed is the correct one. It is their responsibility, but it does not make the dealer or the tech any additional compensation, so the "run around" is usually given. Techs are paid flat rate, so if there is a mistake they need to fix it with no pay for fixing it as they received pay for the first fix. With that said I was able to get mine replaced with the fluid/flush. As of now its shifting very smoothly again.ScatPack is correct. TSB 18-NA-355 is the one you want, but it also states to not replace the torque converter. I really like the car and hope to get at least 100k miles out of it. unsw accommodation for international students birmingham asian market. I was doing about 70-80 mph w/ cruise control and the rumbles would come on grade changes. At first I thought it was the road, but then realized it was the car and started to worry. The car performed great during my first round trip, but on this second one I started to notice the shudder while traveling through the mountains of Maryland and WV. August, 2019 Bulletin No. ![]() ![]() You know, what could be better than a Cadillac for highway cruising. I bought it specifically for the many trips between Virginia and Illinois I’ll be taking over the next couple of years. I bought the car a little over a month ago. If I still experience any shudder after 500 miles I should bring it back in. The dealer told me I need to drive it 500 miles to make sure the fluid is able to fully circulate in the transmission. I dove the car about 50 miles to test it out and all seems well. I got the transmission fluid changed today on my 2017 CTS 2.0 and the shudder is gone. ![]()
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