2002 supercrew,5.4,fx4 145,xxx miles about 2 weeks ago it snowed and i had to use the 4wd, on the way down the hill and on the freeway a low hum was coming from the front end,which getts louder and quieter with speed. there is no binding or anything that would suggest it being stuck i four by

 

Any odd feelings to the truck since then or just the noise?

 

no

 

Hmm... how many miles on your truck?

 

145,xxx but i am **** about maintnence

 

Have you changed your diff fluid yet? Not that I would think that low fluid would cause it but if its just a noise, its gonna be hard to fault trace even with a lift since it'll probably require load on the transfer case to replicate.

You didnt notice it before using 4wd and noticed it immediately after? Is it possible that one wheel has not fully disengaged? I'd put the truck on jackstands and use 4wd to see if you can hear the noise.

Sorry for asking so many questions man, but its an elimination game at this point.

 

no no problem thanks for the help. the thing is is its still icy in spots and dry in others up here, i DONT drive in 4wd so i think that going from ice to pavement should have jolted it enough to unlock it,any my tuner aint pullin any codes

 

im dreading the fact it might be a wheel bearing

 

My 2002 got stuck in 4wd a couple times... then it stopped working all together. Turns out the vacuum solenoid was going bad and not allowing it to disengage at first and then engage at all.

I also think that my LF wheel bearing is going bad. Weaksauce to replace, I'm sure.

 

yeah probubly well thanks for the help and thank you for serving us