Well some guys say if you do a flush on a high mileage tranny that has never been serviced can produce issues with slipping.
If it was me, I'd do it anyway.
I was just making you aware of it, you can research it on the internet, lots of different opinions. LOL
I say that its more "if its already damaged a flush will reveal just how bad it really is". The friction material from the clutches will stay in the fluid and act almost as if it was still on the plates, but once a flush takes place it will be removed from the system and now slippage will occur. Its masks the symptoms until the maintenance occurs.
I recently got a filter replace and refill, so only about 40 percent of the fluid was replaced and I think thats a nice middle ground. Plus if the truck lasts as long as I would like, with any luck by the 3rd time thats done all of the fluid should be newer (as in not the original fluid).
Fuse 27 has stickers to indicate when its done. If you want to do it yourself the part is like 20 bucks on amazon and its easy enough to do. From the dealership they shouldn't charge you more than 2 hours of labor and the part, so maybe 160 bucks?
Heres the link for that:
https://www.amazon.com/dp/B01C39T92A/?tag=fordraptorforum-20
Depends on the age of the pads and rotors, but I'd have those done if I had no paperwork saying they were replaced. Also lines since if you are doing brakes you may as well get new fluid. I use Motul RBF 600. Probably overkill but whatever.
Definitely plugs, another thing I'd probably just pay the dealership to do since its a PITA. Unless you want install specific plugs, and then I would probably just ask an indy shop to do it.
Tires could be an issue, I don't know the specifics but the stock ones last about 40k, assuming they are on their 3rd set they have about 28k on them so you
could need new tires in the next 10 to 15k miles.
Theres also some "ease of mind" time mods I'd do like a catch can and ABS guards.