One of your belts may be loose or in need of belt dressing.
If it squeaks while it moves but not while it's at idle then the squeaks are body or suspension noise.
try the belt No I have same problem with my 03 1500 hemi..so far I have changed the belt and the tenssion pully, but still have the squeaking noise and when I turn off engin I can hear that squeaking.
Check your universal joints!
There are several things that can cause your Jeep to stall while idling. The timing may be off or your fuel filter may be clogged.
check tension on fan belt(s)
If the car dies while idling, the timing might be off. Other causes can include a clogged fuel filter or a bad spark plug.
Most people will tap the brakes of a car when their car is going downhill, usually to keep the car under the speed limit. The squeaking noise could be the brake rotors or the brake pads.Ê
All what I can say is; I realise this noise around in the age of 6-8 in night while I go to sleep. At that time I thought this was the noise of insects and water boilers noise. It doesn't bother me. After that age I didn't have that. Now I am 58. About a year continuously more loudly and day and night I do hear. It doesn't hinder my work or my movement.
it maybe just a timing problem
what kind of noise?
Most likely the brakes. Try to get someone to stand outside the car when backing up to try to localize it. Had this happen on a Toyota. Next brake job got hardware and pads replaced. No more squeal.
I have a screeching sound in my pick up when it gets up to 2000 rpms. Does not make the noise while idling and starts fine.