Have you heard of the "Chevy Shake"? Not a cold drink, not a model of Chevy, it is the cause of a class action lawsuit about a unacceptable shimmy caused by driveshafts and GM’s 8L90 and 8L45 transmissions.

Models with the Chevy Shake problem

2015-2019 Chevrolet Silverado

2017-2019 Chevrolet Colorado 2015-2019 Chevrolet Corvette

2016-2019 Chevrolet Camaro
2015-2019 Cadillac Escalade and Escalade ESV
2016-2019 Cadillac ATS, ATS-V, CTS, CT6, and CTS-V
2015-2019 GMC Sierra, Yukon, Yukon XL, and Yukon Denali XL
2017-2019 GMC Canyon

2019-2022 Chevy Camaro, Colorado, and Silverado
2019-2022 GMC Canyon and Sierra

Plaintiffs sued GM in 2019. They said they drive GM models and that they shake all of a sudden -- they say at times, they shake uncontrollably.

They officially asked the court to make the suit a class action early last year. Now, more than a year later, the judge has said yes.

Now, a judge has agreed to make a lawsuit filed in the case a class action, which means all drivers who bought certain vehicles will be included -- not just the people who sued. 

https://www.wsoctv.com/news/local/judge-makes-lawsuit-over-so-called-chevy-shake-class-action/W5S6WV2K6JDJDI5U2D5B3PCDEY/

According to Battle v. General Motors, the Hydra-Matic 8L45 and 8L90 transmissions have a “shift defect” that General Motors has not fixed. 

To date, General Motors hasn’t provided an adequate fix. General Motors knew about the defect since at least 2013. When GM tested a vehicle with one of these 8-speed transmissions, the downshift was described as a “neck snapper.” 

Since 2015, General Motors issued at least 13 versions of a technical service bulletin

Drivers with aluminum driveshafts have had to pay for custom steel driveshafts out of pocket. Some drivers got their transmissions flushed to deal with metal shavings caused by the defect. According to one lawsuit, drivers may require replacements of the torque converter, valve body or entire transmission.

When drivers dealing with the Chevy Shake do get replacements, they receive equally defective replacement parts.

In short, General Motors left the consumers to solve the problem with the faulty driveshaft, and allegedly doesn’t plan to fix the 8-speed transmission until at least 2023.

https://knightlawgroup.com/chevy-shake-lemon-law/#:~:text=General%20Motors%2C%20the%20Chevy%20Shake,converters%20cause%20friction%20between%20surfaces.