If you have a failing bearing on one side, you will be able to hear it when your wheel is straight. As you turn the wheel toward the failing hub while moving, the sound will go away because the weight shifts to the good one. As you turn the wheel away from the failing hub, the sound will stay the same or get louder.
Does not sound like a failing hub from the description.
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'99 GTP, L36 bottom, XP cam, Headers, 3.29 gears, FWI, Powrtuner