Joined: Jul 2015
Location: Warren County, NJ
Not sure if this is it, but I figured I'd share. I have a 2014 5.0 MT and was chasing a rattle-type clunk on the passenger side since it was brand new. It would only happen on bumpy roads and my initial thoughts were suspension or body panel. I never really tried to diagnose it, then one day when my daughter was in the back seat, I noticed the rattle disappeared while traveling the same stretch of road that would generate the noise. When my daughter got out of the car, I lowered the headrest and banged on the top of the back passenger seat and recreated the noise that I heard. I fixed it by installing a small piece of foam behind the seat to take up slack when the seat is in the upright / locked position. Problem solved.