Wierd 4 wheel drive problem - 2003 Tahoe Z71

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Dec 18, 2013
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Hi!
I have something wierd going on in my 2003 Chevy Tahoe Z71. The AW drive (auto button) works better than the 4 wheel drive. If I get it stuck in 2H: (1) I switch to 4H and I am still stuck; (2) I swith to 4L and I am still stuck; (3) I pusht the 'AUTO' button and I drive out like I am on dry ground. How can this be? I changed the front acutator motor and the front diff oil looked terrible (including shavings on the plug) so I also put new oil in there. I put it on the lift and let it ilde in 4 hi and 3 wheels spin at the same rate with the front left spinning weakly. But on the road the same problem persists, really bad traction in 4H but decent traction in 'auto'. I dont know what to think here.
Any guidance will be much appreciated. Thanks in advance.

PS: I also replaced the encoder moter recently as that s**t the bed
 
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