Should full time LOCKED front hubs make noise?

[engine]

Mine is a 2002 with the locked hubs. I have a constant whine that is always there in 2wd and goes up and down in pitch with wheel speed. It is not very loud but I am annoyed easily. At first I thought it was noisy tires, but it is still there on gravel roads, and in the rain, and I can hear it windows up or down. I haven't tried 4wd at speed. There are few straight roads where I live. Could it be the front axles/hubs? Does something need to be lubricated I wonder? Or is this normal?

 

[RonD]

Most likely wheel hub bearing is wearing out.

Drive next to a concrete wall with windows down to see if you can hear if its coming from one side only, if its louder on one side then probably hub bearing but I would plan on replacing both at the same time.

If it seems the same on both sides then check differential fluid level

 

[engine]

Everything checked out by my very good Ford dealer. Verdict: tire noise!

 

[pjtoledo]

solution, volume knob!

edit: tires don't make steady noise on gravel roads.