NEXTGEN ALLISON UPGRADE KIT: https://nextgendiesel.com/products/project-carbon%C2%AE-10l1000-high-pressure-diy-valve-body-upgrade-kit?srsltid=AfmBOoq5ycUyv4euS7a0uQZOUEejBXD43f16DT5-OYiUi1JJcl4Fz6ri&variant=43582624333997
LATEST GM TSB: https://static.nhtsa.gov/odi/tsbs/2025/MC-11018531-0001.pdf
Not only is GM having a lot of issues with the 6.2L V8, transmission still have not been fixed.
GM has not solved their valve body transmission issues still, this has been going on for years since about 2020. Customers continue to be stuck without vehicles, sometimes for months waiting on either new valve bodies or new transmissions depending on the severity of the issue.
