I have a cricket chirp squeak coming from under the truck and I wanted to put this up here to see if anyone can help identify it while I try to figure out what is causing it.

The chirp sound appears at about 3m 25sec into this video
https://www.youtube.com/watch?v=DsxtBNzo-2o
I mounted a camera next to the rear spare tire carrier winch to capture this video.

I've tried the following to identify it:
1. Lube the drive shafts
2. Change front brake pads (changed them even though the old ones were fine)
3. Cleaned the rear drums / brakes and greased the contact points.
4. Checked for play in the drive shaft u-joints and double cardan joint.
5. Pressing or releasing the clutch pedal doesn't affect the chirping (throw-out bearing).
6. Checked for play in front and rear tires...for wheel bearings, ball-joints and tie-rods.
7. Depressing the brake doesn't affect the chirping.
8. CV axles aren't leaking and boots look fine...not sure what they sound like if they're internally damaged.

It starts making the sound after driving a mile or so, then continues till I come to a stop. I can hear it at low speeds (20 - 25 mph) and changes respectively with speed. I can't tell at higher speeds because the muffler and tire noise drowns out everything else. It sounds like a rotational squeak. I'm wondering if its just the poly bushings on the steering rack or anti-sway squeaking. Any input greatly appreciated.