We bought our 2017 DD R/T used with 37,000 miles almost two weeks ago. I drive it everyday, city driving and has been great! I drove long distance for the first time last week. Got to my destination, parked it for about 4 hours, started it up and felt and sounded like I had a flat tire but all was good. Then it was louder, like I was dragging my front end. Pulled over and look underneath and nothing. Took off again and sound like it was a car that has been through the ringer, people looking at me wondering what the heck. I switched it from automatic to manual and it was smooth. Maybe it was a coincidence but I drove home that way as I was terrified something was really wrong. Took in to be looked and because they can’t get it duplicate they can’t do anything!!!!! Well I recorded it and I was able to get it to do it again three times and sent the video to the servicer and they said that they need it to do it for them otherwise they can’t figure it out. I need help with this as I know something is wrong and I don’t want to drive my kids around and wait for something bad to happen. Please see attached video for the sound. It sounds like a lawn mower with a rock stuck in it as the car engine is running. The video is at the below link....

 

Sounds like a leaking exhaust.

 

 

Probably the AWD/4WD transfer unit. Might be getting stuck between modes.

 

+1

Just had broken exhaust manifold bolts replaced on mine and mostly noisy when engine cold

 

If it only does it when the engine is cold, it's probably something like a broken exhaust manifold stud, cracked manifold, or some other bolted exhaust area. Maybe when you shifted to manual mode was right about the same time things got up to temperature and expanded enough to seal up the exhaust leak. If you can draw a correlation to it being when the engine/exhaust is cold, as the dealership if you can drop the truck off the night before and be present when they start it so you can point out the noise.

-Rod