[Jangle]

Ok so I am officially having my first issue on my 2004 F250 4x4. Sowhen I have the Cruise Control set I start getting a vibration. Noticed it to start with in the 60-70MPH Range, if I give the truck more throttle it goes away, until I break 80, or if I just let it coast it goes away. So playing around with it, I got around 50 mph held the throttle at about 15-25% down and it was so bad that the steering wheel was shaking. Don't hear anything funny in the wheels at low speeds or high speeds. No weights missing on rims that I saw, drive shaft isn't missing it's weights, joints are old but no caps missing or anything crazy. I thought I had heard a popping sound in the front left hub while turning at low speeds, but never heard it again. Noticed this vibration while driving back home from fishing all day today with the kids, so when I stopped and pulled it in the garage I noticed while idling before I shut it off the truck was shaking back and forth sideways a little and the idle sounded like it had a real big cam... thinking harmonic balancer worst case, already found about the needle bearing in the front locking hubs, going to check balance on tires and differential fluids, uujoints as well in a bit. Anyone else got any ideas or best guess at the issue?