Humming noise at 50 and 70 mph

Last week I noticed that the truck makes this resonate hum sound at 50 and 70 mph. It goes away if I go faster or slow than either of those. My wife says it must be coming from the driver's side since she can barely hear it. I did some searching on the forums and saw some comments on wheel bearing, differential, and even exhaust (mine is stock).

I lifted the truck up and checked the wheel bearing by try to move the wheel/tire. I learned nothing...but maybe I don't know what to look for. I drove at the speed that caused the hum and shifted into 4WD with no difference. I changed to sport mode and shifted to lower and higher gears and still no difference.

Any ideas on what this could be?

 

Went for a drive a noticed my rear rotors feel hotter than the front. Neither side seems hotter than the other just front to back.

 

I'll probably have to find a hill to test that out since it is a pretty narrow range that is makes the most noise in. I'll try to find out though.

 

It doesn't go away if I let off the gas. It does seem to go away if turning left. The passenger rear rotor seems to be hotter than the other (used an infrared gun).

I'm guessing this point to a wheel bearing, but is it possible it is something to do with the brakes?

 

My truck sounds like a semi in the rear end when I go 50+mph. Had that noise since new, almost 130k miles now, changed diff fluid recently, looked clean. 2010yr model, 4.10 ratio. It's not loud or abnormal by any means, but you can definitely hear it, especially when I removed rear seats about 10yrs ago.

Could it be your tires wearing away and starting to sound different?

 

I recently put on a set of new take offs with less than a 1000 miles on the wheels and tires. So it could be, but it seems unlikely. I recently changed diff fluid with amsoil too.

 

I have nothing to contirbute other than funny meme. Good luck with humming

 

In the spirit of memes...for the OP

 

Well, I took the wheels off the rear to see what I could see. I've felt some pulsing in the brakes so I took a look at pads and rotors.There is some rust and pitting on the back of the pads. While I didn't measure the rotors for thickness, I figured I'd replace both. I thought it might be possible that there is some rubbing because of the pitting or the possible warpage. I'll update with the results.

 

Yea our oem brake rotors blow. I've warped two sets in 77k

 

I decided to go with Stoptech Cryo Rotors 120.44157CRY and Akebono Performance ASP1304A pads

 

Man i just installed the stoptech hd towing kit truck stops on a dime. Was told that oem rotor and pad combo are a known problem with these trucks.

 

Well, so does mine with everything stock. Stopping 'power' becomes an issue when traction limit of the tires is exhausted from heavy brake application, is it not?

 

• My truck did not have a stopping issue it had a rotor warping issue. With the stoptech i get better bite for sure. Every time ive used the brakes heavily shudder starts and after that it continues until i resurface or swap rotors. Im hoping this Combo eliminates the warping issue.

 

Well I replaced the rotors, pads, and even the rubber caliper hardware. I use permatex ultra on the pads and silaramic on anything that would touch rubber, for those who are curious. The hum is still there at 50mph, but I didn't hear it at 70mph.

A strange thing happened, though. When I took off the driver side rotor, the spring retainer for the rearmost shoe (for the parking brake) came off. It was damaged. Nobody in town had one so I bent it back enough so it could hold the pin and reinforced with some JB weld. After re-assembling, I still need to adjust my parking brake...which I thought I had dialed in.

I'm guessing it must be a wheel bearing.

(edited for spelling)

 

I have the same hum around 50 only that showed up around the same time a new set of BFG AT KO2s were installed. The hum follows one of the passenger side tires front to back, so I know its a tire. Maybe try a rotation to see if your noise moves.

 

In my experience if there is a hum that stops when you turn the wheel, its a wheel bearing. Had this on two prior vehicles.

 

I rotated my tires front to back to see if it changed and it appears to be the same.

 

Why not drive until it gets worse? It should be getting louder/worse gradually, not like it'll be catastrophic failure right away. This way you will definitely know what's wrong when it gets louder.

 

That is my current plan.

 

I had same issue ..sounds kind of like a belt thats about to snap inside cabin..a humming noise only over 40 mph. My 2007 FJ Cruiser has 197,000 miles and after 12 years this is the only issue Ive ever had with it. Love my fj lol. After changing wheel bearings both front & back and finding out my original ones werent even that bad. I just had my neighbor mechanic change my STRUTS AND SHOCKS...and NO MORE HUMMING! Yay! solved finally. Hope this helps

 

Well that makes me paranoid about my rear shock replacement. Everything looks good, but I suppose I could double check the torque on everything. I've probably put 2000 miles on since replacing them and not had an issue (other than the noise, I'm experiencing).

 

17 Super Crew with the loudest at 50 and 65 hum. I can feel it in the steering wheel. Nothing but the speed of the truck changes it. Not turning, braking, what gear it's in or even if it's in gear or not. I took it to the stealership for an overdue (70k) transmission flush. It did smooth the shifting and I asked them to take it for a ride. He took it for a 12mile ride and said I need front wheel bearings @ $1500. Several others also said it sounded like front wheel bearings. I found some "better quality" bearings and had a friend's shop do the work. $800. later and no change. I'm going to do more looking around under the truck and post anything I find.

 

You need that mechanics ears machine. Has 6 or so mics and you place them around where you think the noise is and switch channels until the sound is the loudest. Helps track down noises like this.

 

https://www.youtube.com/watch?v=KwoMUejhs_Q