I noticed that when i go over little bumps in the road sometimes I get a squeak when the back tires hit it...I think it may be a bad bushing or dried out isolator...any thoughts?

 

My 04 GT does something similar when I turn right over a hump at slow speed. But mine is from the front. Most likely a bushing. Maybe the use urethane bushings which are bad for squeaking. Or maybe just spring noise. :dontknow: