Here's another noise thread: I've been getting a sorta roaring noise only under load, it's not a rumble, rattle, grinding, skraping, or high pitched whine. It's more like a moan or mild roar that gets louder directly proportional to road speed and only under load, it goes away as soon as I take my foot off the gas pedal. It starts out almost immediately as I accelerate away from a stop light for example and builds in tempo until around 30-40 mph, then seems to go away and comes back sounding a bit higher pitched at 50+ and just keeps getting louder the faster I go. It's not present in neutral at any road speed or when standing still and revving the engine, only under load and moving. My front driveshaft is out and the center diff is locked but the roaring noise was present before I did that and hasn't changed (I was also getting a vibration around 50mph so took out the DS to replace the U-joints). From reading other threads it sounds like it may be a bearing noise, question is which one, rear pinion maybe??