I have a similar noise from my front end but only with the hubs locked. It doesn't matter if I have it in 4wd or just 2wd. If the hubs are locked it makes the noise. It's the front wheel bearings. You can check them by grabbing the top of your tire and pulling and pushing back and forth real hard. If there is any slop, you need to repack or replace them. If you put it up on a lift/hoist, you can easliy tip and tilt the top and bottom of the tire back and forth to see if there is any play.

You can try repacking them and tighening them back down, but I would recommend replacing them.

Most shops will charge you a bit to replace them because they are also replacing the race too which requires pressing them out. You can do this all yourself, and if you have to, you can just replace the bearing and reuse the old race if it is in good enough condition.

I'm trying to get mine done too, but with the cold weather and with as much snow as we have, it makes for a real pain.

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