first of all i didnt know where to put this thread so here it goes. on my 1999 7.3 i have a problem with it "roaring" kind of like when you have mud tires going down the highwayexcept this is more high pitch. it sounds to me like the bearings in the left front wheel, and got done wasteing $220 dollars on the left hub assembly and figured that wasnt the problem. any one else ever experience some thing like this, one thing for sure is your ear start popping after about 1 hr being in the truck. oh and you can only hear this noise at about 25 mph to 60 mph.??what can it be???