I've got a humming that has started in my 97 F250 4x4. It does get somewhat louder when I turn the wheel to the right.
I replaced the hub assembly on the front driver side (sealed unit) but noise still there. So I replaced the passenger front hoping I just got the side wrong. Humming still there and has gotten louder. I recently have had the seals, ring and pinion replaced on my rear differential as well. Does anyone know what else the humming could be coming from?