Automatic Transmission Control Module problems of the 2020 Chevrolet Silverado 3500

The sudden rear wheel lock up recall that gm has released for the 2020+ silverado's with the 10-speed transmission does not go far enough. The recall simply reprograms the pcm to alert the driver 10,000 miles prior to the valve in the valve body failing, puts the vehicle into limp mode, and extended the warranty on the valve body to 15 years or 150,000 miles. Gm states there is no fix available and this is not correct. Nextgen drivetrain has developed a fix for this per their website [xxx] ). On their site they also provide videos of trucks experiencing the lock up where it seems that the vehicle downshifts to 2-nd gear at high speeds and creates a violent jolt. This is extremely troubling to me as these vehicles are meant to tow, and I am very fearful that this issue will happen while towing a long trailer while my family and I are traveling and putting them in danger of an accident. It is very concerning to me that NHTSA would allow for this type of a "fix". I am not sure if you have seen the videos of this issue happening, or know that a fix does seem to have been developed. I ask that you please reopen this investigation and revisit the way gm is handling this recall, and look into the fix that nextgen drivetrain has developed. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).