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2017 and onward Raptors with the 10R80 / 10 speed transmission are notorious for customer complaints about shifting. Probably about 5-10% of those complaints are legit, the other 90-95% are customers complaint about their Raptor because their s00b with a cvt or AMG Merc didn’t shift like that.
Tell them you need another overnight to be sure, take it to a private mechanic and have it checked out. It’s a good price, but, beware, you probably need new shocks, a not insignificant expense. Mileage is on the high side, and hence the price. If it rides nice, accelerates well, doesn’t make odd sounds, etc... give it a 2nd look
Get a “cold soak” start - bring a temperature (laser) gun and make sure it’s not started in the last 12 hours or more. If you hear marbles in a can at startup, it’s needs cam phasers.
check the twin panel moonroof. ( there are probably less than 250 Raptors without the moonroof from ’17-’20 ) pop to vent position. If you hear a pop sound, that’s the gasket grabbing the glass and it hasn’t been maintained. close, repeat until it doesn’t ‘pop’. Then open to the rear and close. make sure it’s not broken.
crawl under and hit it with a super bright light. Look for leaks and check the oil pan in particular. part way through ’18, they changed from the plastic to the metal pan. Most are fine, but some leak and when they do, getting a correct repair is very difficult.
at 138, I’d be looking for infrequent service items - trans fluid, diff fluid, transfer case, radiator, blinker ( just kidding )
If everything checks out, I’d be intrigued myself but that aside, why not?