@Bacon6 This is what I'm doing on my 8 speed for the first time (137K miles). I purchased the Mopar fluid and pan. Yes, you need to replace the pan IMO, it has the filter built into it. You want that new filter! I really wanted to do it myself. After watching what I perceived to be the correct process, I realized I would really prefer a lift to do it. Not saying you can't do it without it, it just seemed safer and ensures it's level. I just don't personally like the idea of starting my truck up on jack stands, switching gears around and jumping in and out and laying under it while it's running. Guy's do it all the time though! There has to be a small shop that will do it for you.
I bought what I needed awhile back, so don't recall exactly how much I paid, but I'm thinking $350ish for the new pan and around a hundredish for the fluid. So, $400-$500 or so. Local smaller shop will do the labor for $230 out the door. I'm in $650-$750 or so. I'm confused about the dealership refusing, some will gladly do it for $1k+ from what I have read. It seems this is one of those trucks your looking to get 300K+ miles out of. I don't care what the dealership says, I can't wrap my head around pulling that off without ever changing the tranny fluid. Maybe if you never towed anything, IDK. What I do know is fluids break down, this is almost kindergarten physics101. They do claim lifetime transmission, but lifetime is not defined whatsoever, so that's a pointless claim. IMO, the definition of lifetime to them is the 100K mile warranty and that is not explicitly defined by them and passed to us as valuable information. LOL. It's just part of the planned obsolescence game IMO.
My two cents; to save a little, just get the parts yourself and keep searching for a shop that will do it. If you are hesitant about not having a dealership do it, I get it. There's no guarantee my plan won't go real wrong. But the reality is, if the dealership or anyone else does it and it goes wrong, they'll claim no fault, after all, it's a lifetime transmission as DEFINED by the manufacturer, you weren't supposed to change it. LOL. Good Luck, if my tranny is wrecked after said plan, I'll report back!