Hi. I bought my new 1500 on Dec 28, 2019. I noticed about a month ago a loud rumbling noise. I turned the truck off and thought it would go away but it didn't. Drove all the way home with it so loud. I could feel it vibrating under my feet. I was so upset. I just got this truck! So the next day I called the dealership and they said bring it in. Of course the next day it wasn't making the noise. They said bring it in anyway. I brought it in and they said it needed a software update. So I haven't heard the noise again until Sat night. I rode for 40 mins with it so loud. It would rumble and then stop for about 4 seconds and then start again. For 40 minutes! I have no idea what it could be but I'm regretting buying this truck. I feel like I got myself a lemon.