2003 4.0 FX4

So I recently started hearing this noise from the front end. Not a knock or anything but a consistent 'whum whum whum whum whum' that increases and decreases with speed. Almost sounds like a big mud terrain tire on the highway, but off and on like stated above.

I noticed that once I put decent pressure on the brake, that it goes away. I researched that the caliper bracket bolts commonly back out, but I went under the truck and they are all tight.

However, I did notice that the caliper is loose on the drivers side. The caliper seems to have play on the slide pins. The Caliper bolts are tight as well. Would this cause the noise I'm hearing? I would think that would just create a rattle over bumps rather than a linear noise.

As far as getting the caliper tight, would new pins do the trick or are the caliper holes almost bored out and they are floating around inside the hole?

Also, I put the wheels up checked the wheel bearings and there was no play at all.

I appreciate the help in advance and really want to figure this out asap!

Thanks

 

sounds like your front tires are cupped rangers are known for that mine did it rotate your tires it will stop making the noise

 

I plan on rotating them today, just to eliminate that problem, but the noise seems a little heavier than what tire could make. You know how you kind of hear tire noise outside the cab, well it almost resonates up through the cab?

Maybe the cupping is putting more pressure on things to do that?

Thanks for the reply

 

your welcome let me know if that does it

 

There's a chance your wheel bearing(s) are going bad. Jack the front end up and see if the wheel has any play

 

Just rotated the wheels. They are 33" BFG All terrains, so I cross rotated. Also had the wheels balanced and the front end aligned. Still the noise is there.

I did check the wheels bearings like mentioned above, and there is no play in the wheel at all.

 

check fluid in front end mite be low & making the noise

 

yeah check the front diff, mine ran low and started making noise. I filled it back up and I still have the noise so I might have damaged some bearings

 

is the sound metallic , then it is a bearing , if not then you probably have a separated belt in 1 of your tires