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Q: Drive train seems to "crab" on 2001 GMC Sierra C3

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When turning at low speed, as in a parking lot, the front seems to "crab".
(3) Answers
(1) Comments
This could be caused by a defective or glazed power steering belt and or belt tensioner, that is causing the belt to skip. This is actually pretty common.
I was think of perhaps a bad sensor in the AWD system. This would send a bad/incorrect signal to the control system.
Mine did the same thing and it ended up bieng a bad gear in the center differential. Had to have it replaced. Spendy, but fixed the problem.