Owners of the 05-06's will know what it is, but for the others it's a squeaking/chirping sound that in my case emanated from the distributor.
Sounds just like a belt chirping, or a Monkey Laughing.
All due to a lack of lubrication at the upper bushing. And left go can incur some serious engine repairs as it will wipe the camshaft drive gear, as the distributor shaft binds up on the bushing..
Silly Chrysler shot some grease into the housing then plugged the hole. Supposedly when the grease got hot, it would seep down into the bushing and lube it. Ok, I'll buy that even with the route it would have to take to get there, plus the fact eventually there is no grease left.
I pulled the distributor, took it apart and sure enough that's what I found.
Bone dry and just starting to show some discoloration from heat on the shaft.
I removed the plug that's installed into the distributor housing to seal off the grease installed at the factory and found next to no grease.
Okay how to fix this? Well here's what I did. Chrysler's way had grease liquify, then find it's way uphill between the bushing and housing, past a seal, and then drop down between the bushing and shaft.
Not me, I drilled right through the bushing, via the hole in the housing. Straight shot for the grease to get to the shaft. Installed an angled grease fitting where the plug was originally. Reinstalled the shaft,applied one pump from the grease gun, spun the shaft, and pulled it back out. Was greeted by the sight of a nicely greased upper shaft and bearing.
Figure on giving her a shot of lube every once in a while just to keep her quiet.