Originally Posted by Jace2010LGT
Next time you are on an empty stretch of road get it to make noise then put it in neutral and see if it changes or goes away. If it stays the same it a driveline issue. If it goes away its a power train issue.
So, I gave this a try. Put it in neutral and it still made the noise for sure. I couln't tell if it was from the engine rpms dropping to idle but the sound seemed slightly quieter.