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my 06 gmc 3500 sierra has pushbutton 2H,4H and 4L. When I am in 2H the front axle shafts still turn although the drive shaft does not. I thought the axleshafts were also supposed to disengage. anyone know? thanks
 

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The axle shafts will still turn, there is a actuator in the front axle that disengages the axles from each other so that the diff. and drive shaft dosent turn reducing some drag but not all of it!
 
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