2 day first time owner, 05 FX4, 100000km, i hear a noise at all speeds, sounds like at the back of the truck, a constant hum, or howl( maybe like a tire noise buy not.), even at 20-30km. someone said this is normal for fords, i don't think the 18inch tires make this much noise so slow. anyway any help would be great. annoying.

 

I read your other post and maybe the inspection you had missed the diff being too low.
Check/change the diff oil and it might quiet it down for awhile.

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