# 1999 F-150 whistling sound **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** noises, ford, f150\ **Created:** [August 11, 2010, 2:38am UTC](https://community.cartalk.com/t/1999-f-150-whistling-sound/53331 "2010-08-11T02:38:32Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![Scott24](https://avatars.discourse-cdn.com/v4/letter/s/aeb1de/32.png) [@Scott24](https://community.cartalk.com/u/Scott24)\ **Post date:** [August 11, 2010, 2:38am UTC](https://community.cartalk.com/t/1999-f-150-whistling-sound/53331/1 "2010-08-11T02:38:32Z")
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? ---
**Author:** ![tardis](https://avatars.discourse-cdn.com/v4/letter/t/f0a364/32.png) [@tardis](https://community.cartalk.com/u/tardis)\ **Post date:** [August 11, 2010, 2:50am UTC](https://community.cartalk.com/t/1999-f-150-whistling-sound/53331/2 "2010-08-11T02:50:07Z")
"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? ---
**Author:** ![Xebadaih](https://avatars.discourse-cdn.com/v4/letter/x/d07c76/32.png) [@Xebadaih](https://community.cartalk.com/u/Xebadaih)\ **Post date:** [August 11, 2010, 3:28am UTC](https://community.cartalk.com/t/1999-f-150-whistling-sound/53331/3 "2010-08-11T03:28:16Z")
When was the last time the rear differential was serviced? ---
**Author:** ![Scott24](https://avatars.discourse-cdn.com/v4/letter/s/aeb1de/32.png) [@Scott24](https://community.cartalk.com/u/Scott24)\ **Post date:** [August 11, 2010, 12:47pm UTC](https://community.cartalk.com/t/1999-f-150-whistling-sound/53331/4 "2010-08-11T12:47:47Z")
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. ---
**Author:** ![tardis](https://avatars.discourse-cdn.com/v4/letter/t/f0a364/32.png) [@tardis](https://community.cartalk.com/u/tardis)\ **Post date:** [August 11, 2010, 1:00pm UTC](https://community.cartalk.com/t/1999-f-150-whistling-sound/53331/5 "2010-08-11T13:00:07Z")
Can you change the sound by lightly applying the brakes? ---
**Author:** ![Scott24](https://avatars.discourse-cdn.com/v4/letter/s/aeb1de/32.png) [@Scott24](https://community.cartalk.com/u/Scott24)\ **Post date:** [August 11, 2010, 1:41pm UTC](https://community.cartalk.com/t/1999-f-150-whistling-sound/53331/6 "2010-08-11T13:41:27Z")
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. ---
**Author:** ![Scott24](https://avatars.discourse-cdn.com/v4/letter/s/aeb1de/32.png) [@Scott24](https://community.cartalk.com/u/Scott24)\ **Post date:** [August 11, 2010, 4:16pm UTC](https://community.cartalk.com/t/1999-f-150-whistling-sound/53331/7 "2010-08-11T16:16:06Z")
it has never been serviced ---
**Author:** ![Xebadaih](https://avatars.discourse-cdn.com/v4/letter/x/d07c76/32.png) [@Xebadaih](https://community.cartalk.com/u/Xebadaih)\ **Post date:** [August 11, 2010, 7:00pm UTC](https://community.cartalk.com/t/1999-f-150-whistling-sound/53331/8 "2010-08-11T19:00:25Z")
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. ---
**Author:** ![Scott24](https://avatars.discourse-cdn.com/v4/letter/s/aeb1de/32.png) [@Scott24](https://community.cartalk.com/u/Scott24)\ **Post date:** [August 12, 2010, 1:31am UTC](https://community.cartalk.com/t/1999-f-150-whistling-sound/53331/9 "2010-08-12T01:31:30Z")
Could this be the U Joint and how expensive is that to repair? It was making the noise again tonight when driving home.