Hi guys, have a strange question for you, I have a 97 b3500 van that has run really well for me, all of a sudden now, when I'm driving her, she starts a low whining noise after 30 mph, and it doesn't go away till I'm under 30mph, it seems to be coming from the front portion of the van, its really driving me nuts, I cant seem to point out the cause, so I want to ask if it could be the front wheel bearings, or maybe even the torque converter, the tranny works great, no issues there, I'm just kind of stumped so far,,, any help is greatly appreciated,,,, thank you,,,,,

 

Fan clutch.