Humming noise
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Junior User
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Humming noise
(Red text = edits after original post)
There are a lot threads about noises here. I read through a number of them but can't conclude anything.
So here's what I got.
Humming noise starting at 10MPH and can't hear i after 65MPH
At a low speed and with friends sticking their heads out the windows. The sound can't be pin-pointed. The hits you like a Bose surround sound and you can't tell where it is coming from.
Thanks for any help!
There are a lot threads about noises here. I read through a number of them but can't conclude anything.
So here's what I got.
Humming noise starting at 10MPH and can't hear i after 65MPH
At a low speed and with friends sticking their heads out the windows. The sound can't be pin-pointed. The hits you like a Bose surround sound and you can't tell where it is coming from.
- The noise started 3 months ago, shortly after I had a caliper replaced.
- Have had the same tires for 3 years. Normal wear. The mechanic is thinking it may be tire noise. Can a tire(s) really just start making noise? They are Firestone Transforce HT's 265/75R16 @ about half meat.
- Carrier bearing replaced 14 months ago. If it happens to be the carrier bearing, this maybe while it is hard to pin-point where the noise is coming from. I did have the drive shaft seal on the differential replaced (14 months ago with the carrier bearing).
- The mechanic said he put the truck on jack stands. I'm thinking it was on the axles. He didn't hear the humming. So that kind of rules out the carrier bearing doesn't it? Since there was no weight on the axles, i'm thinking it has to be bearing or joint and one of the wheels.
- I know the noise isn't from the motor. At 30MPH on an empty road, I shifted the truck from DRIVE to NEUTRAL, and shut the truck off. While rolling down the highway, the noise was still there. Should I try shifting the transfer case into NEUTRAL? Will this help solve anything?
- The noise changes pitch and tone the faster I go. If I pulse the throttle while cruising I can make the humming noise "miss fire." Matching cadence with the sound of the accelerator being pulsed. If that makes ANY sense.
Thanks for any help!
Hotshot
Joined: Dec 2006
Posts: 14,069
Likes: 17
From: Melbourne, Ky
Check the oil level in the rear differential. Look close at the metal sticking on the plug. It sounds like it might the carrier bearings in the differential. But there are some other things that should be checked before going into more.
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Junior User
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Will check the rear fluid tomorrow. I did have the drive shaft seal on the differential replaced (14 months ago with the carrier bearing).
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Hotshot
Joined: Dec 2006
Posts: 14,069
Likes: 17
From: Melbourne, Ky
Have you checked the air pressure in your tires? Tried rotating and balancing them?
Wheel bearings are another possibility.
Wheel bearings are another possibility.
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Junior User
Joined: Sep 2012
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Have been quiet since I bought the truck. It was a shot in the dark that they may make noise all of a sudden.
Junior User
Joined: Sep 2013
Posts: 68
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From: Katy, TX
My truck also started making a humming noise within the past couple months. Took it to the shop a few weeks ago for an alignment and found out the front driver's side wheel bearing was bad. Replaced the hub assembly last week and no more humming sound.
Veteran/Sheepdog
Joined: Feb 2012
Posts: 6,047
Likes: 110
From: Western AR
If the noise changes with accelerator pedal application/non-application, this is pinion bearing issue. Going through this with mine right now. It is louder at certain speeds with constant pedal application. If I let off the pedal, humming disappears until I get back in the pedal again.
Senior User
Joined: Nov 2012
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I also have a really bad humming sound from the front while driving at about 40-70mph that gets louder with more throttle. It also seems to get worse the more the truck warms up. I have my turbo out right now and my up pipes are obviously having some leaking problems with the black soot down the sides of them. Hopefully will have it put back together with bellowed up pipes this weekend. I'll post if humming sound is gone after first test drive.
If I don't say anything by next weekend let me know in case I forget.
If I don't say anything by next weekend let me know in case I forget.
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Junior User
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Is your noise related to how hard you get on the throttle or the speed of the truck? Mine increases the faster I go.
Senior User
Joined: Dec 2012
Posts: 373
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From: Arlington, Texas
Mine did the same thing and I chased it for half the summer. Ended up being the carrier bearing. Also had to shim it down 3/4". I did that with the Pro Comp shims. Rule is 1/4" shim for every inch of lift. Make sure it's a later model Neapco carrier bearing and not a direct replacement.