LocoS1

I would advise on the DIY kit from Nextgen many people using it and solving the issue with valve body: https://nextgendiesel.com/collections/10l1000-transmissions-transmission-parts/products/project-carbon®-10l1000-high-pressure-diy-valve-body-upgrade-kit Do you remember the codes regarding trans and if you had lock up by chance?

I've had many buddies who have had to go nextgen and solved the issues prior to the fab rats video being released. If you have seen it.

I think for this 1500 you can try the nextgen drivetrain DIY valve body kit.

Saw this a moment ago: https://www.youtube.com/watch?v=NvQ3fRX7swQ&ab_channel=FabRats

Looks like Fab Rats had great success with the NextGen kit

I haven't installed one yet as , but I have see a few others have great success on the nextgen install kit on reddit: https://www.reddit.com/r/Duramax/comments/1cy1wx1/2023_duramax_transmission_valve_body_issue/