Crawl underneath with a flashlight and look for dinged up shiny spots, close contact areas, hopefully your underside is much less dinged up then mine !
Do you have the noise when pulling out in REVERSE ?
Have a friend push down on the Jeeps rear as you look, WATCH YOU FINGERS, the less surrounding (outside) light coming under the Jeep the better to see under the Jeep with a flash light.
Keep the wheels on the ground when looking, BLOCK THE WHEELS.