i'm about to loose my cool with this thing!!! i have a 97' f150 4x4 w/ 4.6 and the 4r70w tranny. i've been chasing this wheel speed sensitive sqeul for a few months now and i'm at the end of my rope! i drive the thing for a minute or so and depending on the speed i start getting what sounds like a bad wheel bearing noise.
i've replaced all the below, and it still whines!

wheel hubs-driver and passenger side
cv axles both sides
brake pads-both side
rotors-both sides
front drive line u-joints
rear drive line u joints (shot in the dark)
every steering and ball joint (but it's not a joint problem)
outer stub axle bearings in the front diff
and i had yukon 4.88 gears put in about a year ago so that should still be good.

i dosent make any difference if i'm in 4 hi or lo.
the only things i've notice that make any difference is when i steer hard right or left - it tends to change a tiny bit.
also it usaully starts if i hit a sqaure egde bump
the best i can come up with is that it's coming from up front more toward the driver side and i'm starting to wonder if i missed something in the front diff? my truck has around 114k but i've been nice to it
MAN IF ANYBODY OUT THERE COULD NAIL THIS ONE THEY WOULD UNDOUBTLY BE THE MAN!!!!!!!!!!!!!!

 

hey everyone,
i found out what made the stinkin' noise!!!
would anyone have figured it would be the dust seal on the front diff!!!!
guess somethings stump ya hard core. man that was a lot cheaper to fix than the rest of the stuff - on the bright side !!

 

Jeff,

Can you please e-mail me or post more info on replacing the dust seal that was causing the low speed squeal.

I'm in the same boat with that squeal noise.

Can you tell me where the dust seal is located and the procedure to replace it.

thanks,
Terry