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1. Your dealer is a #$%&^@*&^$!!
2. Lift the hood with the truck in neutral and have somebody rev the engine a bit and turn the steering wheel from side to side. If you don't hear any wine, that probably eliminates stuff like power steering pump, belts, and alternator.
3. Many things can cause front end whine. You know it is not tires. If it is a front wheel bearing, the sound will typically change if you are driving along and turn the steering wheel left and right (like changing a couple of lanes on the highway). As you know, the differential can be a source of whine from a bad gear, low fluid (I hope the fluid was checked before spending alot of $ on tires) improper backlash, or a bad pinion bearing.
4. Tell the #$%&^@*&^$!! to get it up on the lift and use a listening device to diagnose the noise.
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