If you're referring to the auto locking hubs. I don't believe any parts move in the manner to cause a squeal. When they're lock everything from the axle out to the wheel moves as one. Its when its in 2wd that the hub will free spin on the axle. So you're problem must an axle bearing I would assume
They only squeal when I put it in 4x4, and it doesn't squeal the whole time. It will stop after a little bit of driving. I read somewhere on here about greasing the hubs I thought it might help. I really don't know what it is.
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