Having a bit of trouble with my 2005 EB Expy. 5.4L 4x4.

First:

Front end noise, Sounds like the drivers side. A buzzing noise that I thought was a wheel bearing. Present at all speeds, incerases with speed. It goes away with a Left hand turn/input. I though it was a Whel Hub assembly. I replaced the Wheel hub, No help. I have heard about bad bearings from stock, But don't really want to replace it again.... I did read one poster that had a bad ring gear in the rear, So I may flush all gearcase fluids. I also read about a vaccum controlled hub... Which may make sense, however I don't remenber seeing any vaccum lines.
Any thoughts?

Problem #2
Every once and A while, I get a Engine failsafe mode, and at first the motor went back to idle. I pulled a code and replaced the Throttle position sensor. Since then it failed again. And shutdown completely.
I was thinking about changing the throttle body next?

Thanks for your time.

 

Are there any rips in the CV joint covers on the half shaft?

 

I do not believe so, But I'll take a look for the tell tale grease sling and ripped boot. I have heard bad CV's clicking in turns, But this is more of a gearlike buzz......