"howling" when driving. louder as speed increases. Cause? on 2008 Dodge Avenger

Wife's car. I drove it yesterday and noticed a "howling" that started at about 15 mph and gets louder the faster I drove. Transmission "feels" fine when driving. Shifting is good. No noise when idleing or reving up engine. No noise in neutral. Could this be transaxle issue?

Asked by for the 2008 Dodge Avenger
2 answers 2 comments
Wheel bearings. Does the intensity and rythym of the noise change or can you hear a difference when swerving left/right at a steady speed?
always check all the wheel bearings first.
Did not think of wheel bearings. I will check those first.
yup. drivers side wheel bearing hub was causing the noise. Went ahead and replaced both fronts. Took less that 90 minutes. Its great to have tools.