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I noticed a strange noise today while turning full lock left or right. It is similar to the noise you here when you are in four wheel drive and turn the wheel. It sounds like a shuddering noise. Could the 4 wheel drive not be disengaging all the way?
Make sure your hubs are disengaged - reach under and try to turn each front axle, if you can't then they are engaged; if you can, then they are free and you need to look at other causes.
I've been able to move the selector (LOCK/AUTO) back and forth while movin gthe axle shaft back-n-forth and eventually get the hub to unlock. Start there and see what happens.
You can also switch it to 4HI and back to 2WD and see if the vacuum pulse will unlock it.
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