I’m very sorry for your loss. If the truck is shifting normally and there are no transmission warning signs, I would recommend doing a basic transmission service, not a power flush.
Use MERCON V ATF in the automatic transmission. Do not use regular old MERCON unless the bottle specifically says it meets MERCON V specification.
Here is a video that can help you.
https://www.youtube.com/watch?v=HJdcWI6m3J4
Please go over this guide and get back to me.
May 22, 2026 at 1:19 AM