I have not tried the gear limiter, but my dealer told me that putting it in Tow / Haul would stop the noise. It did not. So I am back at the dealer again and they have had my truck for over 2 weeks.........again.
I do not believe the drive line is the issue as stated above. I have been able to produce the noise standing still in park, but only a couple of times. a drive line issue would present consistently, but mine does not. You can hear the MDS go in and out, to me it sounds like a quiet "chuff", just an exhaust sound and it is not similar to the light saber sound. You CAN stop that sound with the tow haul switch.
Now, they have acknowledged this sound issue as a known problem and claim that a software flash is available and they have opened a star case with Chrysler on this (thanks to this forum). They certainly DO know that this is an issue, I am not convinced that they know the cure. So far they have had my truck as much or more than I have and still they do not have a remedy for the volume on the radio going up and down. That was to be a 4th quarter flash for a well known problem, but the 4th Qtr is not over yet I suppose.
I love my truck, not this loaner I have, but I do not want it back until Ram makes it right. I will not use a gear limiter / tow haul switch to drive and enjoy this truck, it simply should perform and drive as it was intended to.