Looking at 04 SuperCrew
#17
#18
You Don't NEED to replace the cam phasers... I had an 04 Screw with the 5.4L, cam phasers started ticking around 80K... got alittle louder but not much, at idle when i sold it with 167K it sounded almost like a diesel truck. Never really affected performance. regarding the spark plugs, I tried changing mine at 120K, they where in there GOOD and i didnt want to break them so I left them in there. Shame on me I know, truck ran fine though at 167K on the original plugs.