We are in the middle of an around the U S RV trip pulling a 5th wheel with my 2016 F-350 Dually...

Everything has been fine until a couple of days ago... I noticed going down a hill when I hit my brake to slow down that the truck started make a loud noise... Now even as I take off with or without 5h wheel it makes a ton of noise while it's shifting gears... It seems to take much longer than needed to shift to the proper gear... My tranny temp was in ok... Tranny fluid was ok... It may not even be a problem in the tranny... The thing that is really worrisome is the noise it makes in the cab... You have to raise your voice to talk... We're in North Carolina and have pulled the 5th wheel from Nevada... Any suggestions? Thanks

Larry G...