So I just got this truck,

The 4x4 worked when I bought it, about two weeks ago, I noticed a slight rotation noise and vibration coming from the right wheel. As I accelerate the noise gets stronger and faster, vibrating the cab. Vwooum Vwoooum Vwouum. lol.

I'm wondering if they have anything to do with one another, as the wheel issue got worse the 4x4 began to bug out, and now doesn't automatically switch on when I hit the button.

Any bits of wisdom on what is going on? I know I can't drive it in this condition. Just from my own research I am guessing the front wheel hub assembly needs to be replaced. but I'm not sure.

 

What year and other specs?

 

94 Mazda B4000 4X4 4.0L

 

No such thing as a front wheel hub assembly in a 1994!! It has ( 2 ) wheel bearings on each side of the truck ( inner and outer ) the 1 piece NON serviceable hub assembly you speak of came LATER in newer models. You either have a wheel bearing that is DRY or you have an automatic hub associated with your 4x4 that went out.

Does it sound like any of these videos? This is the most common NOISE associated with a front (automatic 4x4 hub) that went bad. If after watching and listening to the videos that is NOT your noise then I am willing to bet you have a DRY wheel bearing.