Strange vibration. Need suggestions where to look. SOLVED

[SlickGT1]

SOLVED. Transfer Case fluid change. Used Fuchs Titan ATF 7134 FE, recommended by my friends at OMG Moterworks. The whine from the tcase when cold went away instantly. Vibration now gone, have yet to get on a really long drive to see if it will come up later. So far so good.

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Driving around today. 80 mile road trip. About 60 miles in I start getting this insane vibration, wheel shaking and what seems like entire front.

1. Shaking at all speeds.
2. Slowing down, without brakes seems to make the shake even worse.
3. Slapping the shifter into neutral while shaking does not change anything.
4. Pulled over, walked around car to check if anything is falling off, like the wheels, everything is good. As I start to drive, all is smooth for about 5 min. Then it comes back.
5. The faster I go the less the shaking, 70mph plus it is almost not noticeable.
6. Nothing to do with braking. Getting on the brakes does not make it less or worse.
7. Vibrations seem rotation related. Like in sync with speed and wheel revolutions.

So far my list of stuff to check.
1. Tie rods
2. Front drive shaft slop
3. Guibo front and rear
4. Axles and cv joints are original. Not sure how to even check these.
5. Rear control arms and slop? Can this even be a thing? Feel it coming from the front even steering wheel shaking.

Ty in advance.