GMC / Chevy Wierd 4 wheel drive problem

Hi!
I have something wierd going on in my 2003 Chevy Tahoe Z71. The 'auto' or presumably AWD, works better than the 4H. 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 push 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. The same problem persists? I dont know what to think here.
Any guidance will be much appreciated. Thanks in advance.
 
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