Probably the idler pulley or the tensioner pulley on the serpentine belt. Carefully use a little squirt bottle and spray each one with a little water. When it gets quiet you know which one to change.
i dont know but would like to know!!!
it could be the idler puller rubbing on the bearings. we had to replace it on our 2006 Chevy trailblazer ext.
Front hubs my be wearing out.
Without further information this question cannot be answered
heat/ac actuator
IT is your CV Joints which is making this noise.
your wife
sounds like tire/road noise
Mine had a clicking noise and it turned out to be the front passanger side axle assembly.
it is the idler pully. i just replaced mine and all the whining stopped
it sounds like a humming or whinning noise, what year is the truck if its from like 01 or up those trucks have a lot of wheel bearinig problems that some one might misdiagnose as a differential noise or it could be chopped tires making the noise.
Not much info there but my guess would be the the fuel pump.