Hello, I purchased my beautiful black Ram Bighorn in May 2018 and to date have logged 5500 frustrating miles on it. It seems this truck is plagued with the familiar loud intermittent humming noise. One never can tell when it will rear it's ugly head. So far it has been in the shop 4 times and the service dept. has not yet been able to diagnose the problem. fortunately for me they have heard the awful annoying noise so they know that I am not crazy. Company created a case but after two weeks and no problems they dropped it. yesterday the noise and vibration returned. So far dealership has replaced the cats and upgraded the transmission computer. neither have helped resolve the issue. Same old if it's not doing it when you come in we can't find the problem. Definitely having buyer remorse.