1999 F-150 whistling sound

ford
noises
f150

#1

I have a 1999 F-150 V-8 4.6 liter. I noticed a whistling sound coming from the back of the truck yesterday. I thought it was just when I put my breaks on, but it continues while driving. It does not make the sound all of the time, but I have been noticing it yesterday and today. Any idea what this is? We are leaving for Disney World from Ohio on Saturday, and will be pulling a camper with this truck. Any suggestions?


#2

"Any suggestions?"
Yes, pick a cooler time of the year to go to Disney.

Is is really whistling, like an airflow type of sound or is it more of a high pitched grinding/rubbing sort of sound?
Does it do it only while you are moving, or will it do it if you rev the engine while still?
It could be: and exhaust leak, airflow around a loose trim piece or body panel, a brake issue, wheel bearing (usually a low pitched hum though), and so on.
Could you record the sound and post a clip of it?


#3

When was the last time the rear differential was serviced?


#4

I’d love to go in a cooler time of year, but we have to go between kids sports and school starting.
It sounds like the high pitch when the breaks need replaced, but I hear the sound after I let off of the breaks. I changed the front pads and rotors last year, and I had the rear drums checked in the spring. All were good then.
I initially was thinking the breaks, but I hear the sound on and off. It is not constant, but it seems to be there more when I use the breaks. I don’t know that I could record it, because it is so intermediate.


#5

Can you change the sound by lightly applying the brakes?


#6

I don’t think so. It seems to start when applying the breaks, but then continues. I did not notice it at all while driving to work today.


#7

it has never been serviced


#8

Well whether or not the differential is making your noise, you should have that done. 11 years and probably north of six figure miles is too long.


#9

Could this be the U Joint and how expensive is that to repair? It was making the noise again tonight when driving home.