Just today my car developed an annoying whine in the driveline. It varies with wheel speed, not RPMs. I can hear it anywhere above 5MPH or so.
It is not tread noise and tires are inflated to their normal pressure.
It's loud enough that my friend who rides in the car with me occasionally noticed it right away.
It sounds like it is coming from the middle or rear of the car. Someone suggested U-joints.
I replaced both U-joints in November along with a CVPI driveshaft and extended tailshaft housing.
I'm worried it may be related to the differential or axle bearings. The gears and carrier were replaced in January by a professional Ford technician and weekend racer and all bearings looked good so we did not replace any.
Could bearings just suddenly go bad and cause this noise? How would I know if it is bearings or U-joints or anything else?