Humming sound when accelerating

Howdy from Tennessee, I'm Chris aka Moose. Who am I helping today? I'm glad you've come here to get help. I will do my best to get the answer you are looking for. I help many customers, so sometimes my replies are delayed, I will respond once available. I try to be online at 1-5 pm and 10 pm-5 am every day. - Can you duplicate this noise in any way in park idling, revving, or while torquing? - If it only occurs while driving, does swerving or braking affect it? - Will it occur rolling in neutral? If you cut the [engine](/topics-engine-ford/) off, then turn the key back on and roll with the engine off, does it still occur?

Only occurs when driving, gets louder as i go fasterI'm Jose by the way

Welcome, Jose. - Since it only occurs while driving, does swerving or braking affect it? - Will it occur rolling in neutral? If you cut the engine off, then turn the key back on and roll with the engine off, does it still occur?

Only occurs when i go over 30 mph , and swerving or braking doesn't affect it , it's a steady humming sound

Thanks, Does the noise come and go and or change tone based on gaining speed with acceleration or when coasting, Jose?

It gets louder as your speed but it's a steady hum coasting and acceleration it's the same , It gets quit

Thanks Jose, since swerving has no effect normally that rules out the tires and wheel bearings. Since it occurs while coasting in neutral and with the engine off. That rules out the engine and transmission. That leaves the most likely cause to be the rear axle. It may be failing axle shaft bearings or the pinion bearing preload is too low. I recommend removing the rear driveshaft and check the pinion to see if it wobbles or turns too easy. If so, then try tightening the nut 1/8 to 3/16th inch in rotation. Then retest. If the noise is still there, have a tech drive the vehicle. If they believe it is the rear ale then you likely need to rebuild the axle assembly with new gears and bearings. Thank you for seeking us for help, I hope I provided what was needed. Press reply if you need to follow up. If you liked my answer please let me know so I can mark your question complete. Moose

Checking in with you. Please let me know if you liked my answer, or need more help.

It's been a couple of days since you replied. I am going to mark your question complete for now. Reply as needed.