Awd not working correct 2002 Denali

[Yukon_dave]

Hello everyone, I'm new to the forum, hoping you guys could help me diagnose what's wrong with my Denali. I just purchased it a few weeks ago love it so far but I have a feeling my awd is not functioning like it should. The other day I put my trailer on it to see if my air ride works (doesn't ) and my jack on the trailer bottomed out. My old truck would pull that dude through a foot of dirt no problem well my Denali got stuck! I popped my head out the window and saw that only the rears were spinning. I couldn't see the passenger front tire but the drivers side front was definitely not spinning. So I put it on my lift at work and the rears spun but I had to give the truck a lot of gas before the fronts would spin and even then it's like they didn't want to. If you guys have any thoughts please let me know! Also I have the common front dif whine so it probably needs a rebuild but I don't think it would cause this. Just covering all bases haha thanks in advance guys!

 

[Yukon_dave]

I tried to put it in my sig but it's not letting me. It's a 2002 GMC Yukon Denali 1500 6.0l

 

[Rocket Man]

I'm no expert by any means but I do know that when mine was on a lift to get a Corvette servo installed all 4 wheels turned as soon as it was put into gear, at an idle.

 

[pnwdan]

My guess would be that your t case is shot

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