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2003 gmc envoy_sle
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Discussion Starter #1
2003 Envoy 4WD with 125,000 miles: In automatic 4WD sometimes I hear a thumping sound/jerking. It is intermittent. When I stop, place vehicle in park and then move again it is ok in automatic 4WD. What is the problem? I have never had the transfer case serviced. Do I need to change the fluid? One web site said it might be a sensor problem or wiring that is corroded.
 
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