Help!! Having trouble self diagnosing (hum/grinding at high speeds)

[bsmit0975]

First off, I've tried searching multiple fusion threads but I havn't come across any similar threads with my same specific issues. So i'm hoping i can get some ideas on a diagnosis. I've taken the car into the dealer before on the issue, they blamed the worn out tires and sent me on my way (I've replace those now with zero change on the issue).  

Here's the quick explanation:
The faster I go, the more I hear a hum, vibration, and now more recent a hum/vibration/grinding sound coming from the front engine bay of the car. I've been trying to diagnose it for awhile now (i'm fairly car savy) but this one stumps me. 

Here are a couple points that might help in diagnosing the issue:
The noise is directly related to the speed of the car and the input on the gas peddle. When above 45MPH I start to hear the hum/grind of the noise above the regular road noise and it is progressively more noticeable as the speed increases. Between 80-85 MPH the hum/grind noise hits its peak and sounds like it resonates with the resonating point of the car. Its as bad as a high revving 4 banger with an exaust leak. At all speeds I can press and unpress the gas peddle to momentarily make the hum/grind noise to go away but it will then return after half a seconds time. If I leave the peddle press or unpressed(decelerating in the process) the hum/grind noise is constant. Forcing the car to change gears has no effect on the pitch or sound of the hum/grind noise. "Only the speed and gas peddle inputs change to pitch and momentarily make the hum/grind turn off for a moment"

Things I believe I've ruled out:
Out of balance tires or rims, breaks or rotors. 
Driver side front wheel bearing (replaced), I don't think its the passenger front either (No change in noise by harsh steering adjustments)

Things I'm worried about:
Drive train? Half Axles? Transmission? Engine mounts or linkages? Intake or exhaust issues? Turbo Issue? (I still have great performance tho)

Any thoughts?

Those are some potentially BIG and EXPENSIVE repairs that would be above my DIY car repair level. So i've been reluctant to bring my car in for diagnosis but its getting worse and now sound more like a vibration/hum with grinding as opposed to more a hum/vibration like it was 5k miles ago. 


Thanks,
Brady

Car:
80K miles
2014 Fusion 2.0 EB 

Edited May 31, 2018 by bsmit0975

[eGuru]

Sounds like bearings in the CV joints.