Whenever I’m casually accelerating at low speeds I can hear/feel a light rattle/noise/shake from underneath. If I’m cruising at high speeds or really slam down on the gas I don’t hear it. Any ideas on troubleshooting? I took it into the dealership and they said something was probably loose and went ahead and tightened everything up under there but that didn’t solve anything.

 

Check this thread

https://www.jk-forum.com/forums/show...ht=heat+shield

 

You need to get down there and poke around. ( that's what she said )