I have 178k on my 2014 supercrew, got it at 125k, they're amazing trucks and just had my first big issue (A/C condenser leak). You have to remove the whole dash which sucks. Its a great truck and worth it if you take care of it.
-You should definitely look at shocks theyre 1k just for rebuilt through a company like TSW offroad. When mine go bad theyll start to cause a weird bucking at low rpms with slow acceleration around 50-60mph.
- for the 4wd system is a vacuum system that engages the front dif and can be deleted through a iwe delete kit, look up where the lines are if you want that system properly functional and OEM.
- You should probably ask about suspension parts that have been replaced. and whats been changed or the VIN to see if it was taken somewhere for work.
-150k is when your suppose to do a tranny oil change.
- the spark plugs are usually needed to be changed around 30k and theres 16 which could be a decent chunk of change if they skipped the 150k interval for it.
-if its really been a road princess awesome, but you can check the gap between the cab and truck bed at the top middle and bottom for even spacing, if theres a noticable difference in the gap points its probably been heavily offroading.
-some raptors(mine included) has a bad time with blender door actuators which changes the hot/cold of your ac/heater system if you start the truck turn on the climate system and hear clicks from inside the dash theyre not calibrated right or just worn and cost $30 ea with all of them being a nightmare to get to.
-the truck has an oversight with the fuel relay pump and the fuse can melt in the engine bay fuse box. Theres a kit to relocate it so it doesnt have that chance, you should ask about it, if it hasnt been done maybe think about doing it, it isnt hard and is a nice ease of mind.
There are other things but this is already too long, i can give you a bigger list if you want just let me know.