2x4 not working on 2003

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jmurphy4369

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So on my 2003 5.4, while in 2x4 the vehicle will not move, put it in 4x4 it drives fine(makes some rattling noise while driving) ... I am not sure where to start or what to test first: transfer case, transfer case motor, drive shaft, or rear end... Tia for any help ...also have not had a chance to put it on jack stands to test the front wheels are moving (I know test that first but at work and just happened today)
 

mbtech2003

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check to see if the rear drive shaft is spinning in 2x4. Could be bad rear diff
 
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