First off I apologize for the long post but it seems it takes a bit of typing to properly and thoroughly explain some of these issues.....
I have a very very odd noise I just noticed coming out of the rear of my 05 Hemi WK. I just noticed today on the drive into the city after about 10 minutes on the road I am getting a weird clanking and deep hollow clunking that is quite noticeable but only shows up at or around 75 mph and seems related to bumps minor or major. Sounds like something banging around in the rear in the underside of the jeep like a broken tailpipe hitting the floor pan or a loose spare tire (neither the case). I have never had any noises or anything like this before and found it quite odd. I came to my offramp and had to make a harder than normal brake and the same noise but alot more noticeable now on a rough street every little bump I could hear this clunking noise. Weirdest thing is after about two blocks it went away?
So on the way home I left work and no noise even on the same roads and same bumps back to quiet like it should be. After about 5- 10 minutes back on the highway at speed I turn the radio down cause I think I can hear the noise again and sure as the sun will rise it's back! So I scratch my brain on the drive back home (while hearing the noise the whole way home) and getting back to town again pull off the offramp to my house and after leaving the stop sign I am getting a noticeable deep clunking noise again but by the time I get a couple miles down the road at 35 mph speed limits it goes away. So I purposely swerve to hit some bumpy roads and nothing? So I have somewhat related it to heat from braking off the highway and or heat build up from something at higher speeds since it is non-existent in town driving conditions no matter how rough the road.
So I decide to take the Jeep on the backroads tonight to do a heat related brake test. I make about two or three harder than normal stops from highway speed to stopped and by about the third hard brake when I am accelerating away I am getting once again the very apparent noise and within a few miles of back to normal slower driving it disappears. I am REALLY scratching my head here and when I got home jacked up the rear end of the jeep and had a good look / bang on everything under there. Checked exhaust, spare tire, and pretty much anything I can get my hands on to bang for a noise and I found nothing.
So after looking on the forum I can maybe only relate it to a soon to be defective rear park brake system or maybe worn bushings in the rear axle stabilizer arms? I recently within the last couple thousand miles replaced all the rotors and pads but never had or noticed this noise until today really. I did check the rear park brake assemblies and cleaned them up when I replaced the rear rotors and they looked fine to me but who knows? Has anybody got any thoughts or ideas on what maybe the issue or have had a similar problem.
Planning a couple trips back home in the upcoming holiday season and the last thing I need is a park brake imploding or something similar crapping out on me with my family in the car especially on a cold canadian winter. Thanks in advance to anyone who can help me out or takes the time to read and hopefully we can figure this out!!