Will not drive in four wheel drive

2005 GMC YUKON
180,000 MILES • 4WD
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STEVINCE
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Vehicle will not move while in four wheel drive. If I try to switch to four wheel auto while driving vehicle will slow down like the wheels are about to lock up.
Jan 14, 2018 at 6:50 PM
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STRAILER
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Do you have the same size tires front and back?
Jan 16, 2018 at 10:17 AM
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STEVINCE
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Yes.
Jan 17, 2018 at 12:17 AM
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STRAILER
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We are going to need a video of what the car is doing it sounds like the transfer case or front differentials is having a problem. is there any noise associated with this problem?

Can you take a video with your pone and upload it here so I can see whats going on?
Jan 17, 2018 at 9:43 AM