Front wheels skipping in 4WD

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gmfan454

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Hello, I was wondering if anyone would know why when I engage the 4WD system in both 4Lo and 4Hi the front wheels do not spin correctly. The front wheels lock up and leave skid marks on the road. It went from working fine to that. Do the electric 4WD systems still use vacuum and if so, could it be that? It's a 97 ecsb 5.7 Z-71
 

Keepinitoldskool

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The actuator is all electric, no vacuum. Sounds to me like your front diff ate a carrier. I would pull the cover off and give it a look.
 

gmfan454

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Ok. I will look into that. Thank you. Not familiar with what a carrier is but a little Google imaging and my Haynes manual and I am sure I can find it.
 

Keepinitoldskool

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Well if I am correct then there will be no repairing it, it will need a replacement. Remove the diff, easy to do, and open it up.
 

RichLo

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If time is an issue, pick up a cheap junkyard front diff with matching gear ratios and do a quick weekend swap. Otherwise setting up a diff isn't difficult just time consuming and tests your patience at times.
 
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