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High Pitched Whir from Front Diff When Engaged

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As the title states, there is a high pitch hum that gets louder as the vehicle goes faster, but only if 4wd is engaged. It makes me feel like it's going to blow, but it has diff fluid. I have my front axle in pieces, so now I just need a hint on what needs to be replaced.

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I've had the tcase engaged before without being in 4wd(low gear is nice for gravel hills) but never heard the sound then.

That's not possible. Your options are 2WD-High, 4WD-High, and 4WD-Low. There is no 2WD-Low available.


Are you certain the whine is from the front differential and not from the transfer case? My first thought is that you're hearing the drive chain.

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