Need your help trying to identify the cause of this hum I am getting from the front end of my 03 cavy. The hum is only effected by speed. It may get a little louder when I turn the wheels to the left. I know the old wheel bearing saying but I changed the hubs on both sides. The cv axles are new and I just replaced the differential bearings inside the trans. The hum becomes most noticeable above 40 and gradually gets louder above that. Occurs at those speeds regardless of the selected gear and is still there in neutral.

maybe a wheel bearing going bad

Bad wheel bearing, and by the sounds of it, your left one. I'm guessing it goes away when you turn right?


2000 Ford F-250 7.3 Powerstroke 4x4 - Not stock
1973 16' Tahiti Speedboat
1983 200 HP Mercury BlackMax
1997 Chevy Cavalier with 275K miles

Either one of your new bearings is trashed already (it happens sometimes) or maybe something in your tires? check your bearings again. maybe rotate your tires and see what happens

I replaced the bearing on the left side after the noise started and it was still there

Justin,

Have you had any luck resolving your "hum" issue? I have the same problem. Changed out the bearings, checked the control arm mounts, strut mounts, stabilizer links, tried rotating the tires. Nothing worked.

I have been through this as well. Found out when you buy the cheaper bearings that if the cv axle nut is not torqued to the proper specs the bearing can almost automatically start making noise and by that time is usually bad. put your car up on jack stands and put the car in drive to see if you can isolate which wheel this might be coming from. Also noises reverb and travel all over the car sometimes. It could even be one of your rear bearings. But from what you are describing it defiantly sounds like a wheel bearing failure.

The noise was from wheel bearings I had purchased from autozone. They were on the car for like 3 months. Both of them went bad so turning the vehicle left and right really didn't cause a change in the noise. It was amazing how the noise transferred to the transmission. I had countless people under the car while it was on the lift and all of them thought the noise was coming from the transmission. Don't buy hubs from Autozone! At least I know how to overhaul a transmission now LOL