I have a 04 F150 4door 4wd new body I was driving about 65 and started getting a roaring sound when I stopped to check it out as I stopped there was a loud bang didnt see anything under truck as I pulled away it started roaring again I stopped again no bang then it was gone rest of the trip any ideas ?

 

Have you added the friction modifier to the rear end ? I added it to my 03 and it helped the rumble.. Especially on Turns