I picked up a new noise after the last run, thought it was a broken hub but after taking it apart found nothing was wrong. The noise sounds like something that was spinning suddenly went out of balance and oscillated to a stop (thinking its a bearing race somewhere). It kind of resembles the sounds a radiator cap makes when you overheat and it blows off steem past the rubber seal. I can feel it in the floorboards and a little in the steering wheel. Its completely intermittent and definately coming from the front end somewhere. It happends at all different speeds and doesn't change with speed. It happends at all different RPM and doesn't change with RPM. Its the same with the front shaft engaged, disengaged or removed, hubs locked or unlocked. I disconnected the electric fan just to make sure it wasnt the cause and it wasn't. I'm running out of things to check and still no closer to finding it. Its beginning to get more frequent (used to only happen on the freeway, now its happening everywhere). Unfortunately theres no trigger to make it happen yet, still random but I'm beginning to fear whatever it is is going to go out soon... and I'm destined for a 200mi drive. Anyone have a strange one like this happen which sounds similar?