I also feel a vibration on the accelerator when this happens.
It could be bad tires to worn motor mounts.
If the tires are in good shape, rotate them to see if it makes a difference. If not, you could have a bad hub, or motor mount, based on the minimal information. The transmission and drive axle are also possible problems.
SOURCE: humming noise in front end/engine fo 2001 Cadillac STS
Keep an eye on your temperature gauge until we figure this out, just in case & see if it climbs much/any at highway speeds.
SOURCE: There is a loud noise at 45mph.
Find a quiet empty stretch of road. Go 50 mph, put the trans in NEUTRAL and shut the engine. If noise is still there, swing car left and right to detect noise differences. Could be hub or axle bearings. Not engine or trans if noise is still there. Hope this helps
SOURCE: Loud annoying sound when driving over 35 mph
Check the fluid level and make sure. If the fluid level is not the problem, I would have someone do a complete check on the front end.
SOURCE: 2006 Dodge Gr. Caravan. Loud humming noise upon
Misalignment of the belt, incorrect belt, worn or loose tensioner, Too tight of an adjustment (many service centers do this on purpose so when the belt breaks in it becomes properly adjusted, I do not believe in this philosophy), The belt is actually one long belt called a serpentine belt.....
SOURCE: Deceleration whining/humming noise
I would tell the dealer you want your rear differential opened up, checked, and more fluid added. There really is no test they can do other than to pop the cover off the differential.
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