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I’m going to describe this to the best of my ablitly, and see if anyone else has experienced this, or has any thoughts on it. Ive been riding like this for months because I haven’t had a chance to put it in the shop. Truck: 2014 Sierra 1500 4x4 all terrain slt w/ 6.2. 4 inch lift. 33” tires. 20” wheels. The sound: sounds like something rubbing/ slightly grinding. It has to be something rotating. It can be a faint noise or something loud that really grabs your attention. When it occurs: When everything starts warming up nicely, generally somewhere around 2 miles into trip. it’s by far the worst once you get to the speed you desire and stay there ( with cruise or just using pedal ). happens on occasion when accelerating up to speed, but not near as often. It never does it when slowing down. Duration: there is no pattern to it whatsoever. It could make the noise for .2 seconds. Stop for 12 seconds. Grind for 4 whole seconds. Stop for .5 seconds. You get the picture. Its continuous, in a sense that if you have a 100 mile trip, it’s going to continuously start and stop the whole way. Other things to note: i have noticed that as soon as I hear the sound start, I can let off of the gas, or give it a little more and it immediately cuts the noise out. As soon as I hold the pedal and maintain speed, it starts back up. The other her thing I’ve noticed is that the rpm needle is steadily moving at all times. Example, running 70 on perfect flat smooth road, cruise on, the rpm needle is Jumping back and forth about 100 rpms. I have tried to be detailed and thorough, so let me know what you guys think if it sounds familiar.