i have a 99 f-250 with the triton v8 5.4L , i am getting a noise from the front end kinda like a schreaching noise, it only seems to be on teh driver side, i looked under neath and the 4x4 drive shaft seems to be locked in, now the hubs are on auto and the 4x4 is off, i though it maybe a u joint but they usually knock when there bad, anyone got i deas i just put in all new seals and wheel bearing on teh fornt side so i thnkin maybe the outer hubs are going bad now and is making it try to engage when i am going down the road, but sometime it makes no noise so i really confused. e-mail me at kylegruenwald@yahoo.com if u have any ideas i dont check this to often