Why after I took my four wheel drive out the front wobbles? sometime and over 55 mph its making a loud humming sound?

Wheel bearing. Usually if you are driving and you turn the radio and air cond off and roll the windows up and listen carefully... When driving highway speed swerve gently left anf back to center.. then right and back to center. If the "hum" changes tone, its the wheel bearing. I would bet thats your issue though.

For the wobbling. Can you feel the wobbling in the steering wheel? If so. 1 Check tires for knots or steel breaks, 2 bent rims. 3 Check lug nuts, Also check oil-grease in front end. Humming could very well be dry front end or bearing.