I thought we could use a dedicated thread for this issue. Our Renegade Trailhawk 2015 with just under 49k miles has a rumble that intermittently comes and goes. Usually when we accelerate and let off the gas it will start. It starts low and increases volume and then subsides to a low constant volume. It's like running over a rumble patch but softer, more muffled. My husband found that if the 4WD lock button is pressed the rumble will slow, then stop completely. It's as if something is turning off and the rumble starts then if we turn 4wd lock on it stops. I've read many Renegade owners have this issue. Any ideas?