I have a 2000 F250 7.3 AT I have a bad vibration about 65mph and on. It sounds like an excersize bike freewheeling. Im thinking maybe a wheel bearing. Any advice would help.

I could easily be wheel bearings, which normally only last 100,000 miles. Try test loading the left wheel bearing, by turning the steering wheel to the right and then back again while at freeway speeds. Listen for any changes in sound. Then, repeat the test for the right wheel bearing, by turning the steering wheel to the left and then back again.

Additionally, check the front differential (5.9 pts. Mobil 1 Synthetic 75W-90, GL-5) and transfer case fluid levels (2 qts. Of Mobil 1 Synthetic ATF, tighten 10mm hex drain and fill plugs to 20 lb.-ft.).

What side is it coming from I need to now before I can help