front left pulling and weird sounds on 2004 Ford Explorer

my truck recently feels as its pulling to the left. sometimes it does and others not. when i let off the gas its when it does it the most at higher speeds, also sounds like a humming noise.after 40mph its not so bad. had brakes and rotors checked and is fine. its an on again and off again thing. was told was maybe the 4 wheel drive was interfering. dont want to pay for a diagonist computer check, was wondering if i really needed it. any suggestions?

Asked by for the 2004 Ford Explorer
Sorry to see you didn't get some help with this. Were you able to figure out the problem with your explorer? I doubt a computer diagnosis will tell you much, this sounds like a wheel bearing, drivetrain or suspension problem to me.
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