A few months back I had the chirp noise and vibration at 30mph. As per advice and usual, it was rear ujoint on front prop shaft.
A local driveshaft company I have used for 30 years knew the issues of these, and already custom makes heavy duty shafts with Jeep greasable ujoints and special center coupling/ball piece. THey put it in and all was well and drives great.
A few weeks ago I noticed a squeak. Sounds like a squeaky wheel actually, gets loud but is inconsistent. Sometimes starts right when moving, sometimes at 30, sometimes stops when let off gas, sometimes doesnt stop until you stop.
It sounds like it is directly under us, but i have gone over the front shaft about 50 times. It is perfect. No cracks, not loose bolts, plenty of heavy duty grease, and rear shaft is the same.
I pulled serpentine belt and grabbed all pulleys, nothing loose or not loose to me, nothing makes noise when I spin. Besides, if I am in park and rev motor, no noise.
Only thing I notice is my brakes, all 4, are stating to get grooves in rotors and need pads in about 2000 miles or less, so ordered some d/s rotors and green pads. I read the rear brakes have a plate or something that can make noise, but most of my experience wit brakes is a whistle or screach, not a squeaky wheel sound.
There is no vibration, other than typical big radial/truck type tire and doing 80 mph on different roads. Accelerates great and strong, no pulling, no looseness, NO engine codes or any codes. Stops great as well.
Any ideas appreciated, hoping brake job solves it. I am confident its not driveshaft, so not worried of driving it, but it is annoying and loud at times.