i know im always asking questions but i use what i learn to help(attempt) others

im getting a ticking noise coming from the back when i get under the jeep it sounds like its my glass pack it started doing this after i got it and it gets kind of annoying put i can only feel/hear it when the car is off anyone have any ideas?

i searched it but non of the posts match my circumstances

 

metal will tick on exhaust when contracting and expanding from heat