Front diff not engaging or tcase?

vipergtrdj

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Question - I have a 04 Silverado 2500hd 6.6 with push button 4wd. I am having a problem with it locking into 4wd.

With it in 4hi and truck moving the front driveshaft does spin. So, I pulled the front diff actuator and verified it moves when 4hi/4lo is selected. I put it in 4hi with the actuator off front diff and cannot turn the front driveshaft by hand. When in 2wd I can spin the driveshaft, so that tells me the transfer case is engaging.

With that being said, am I right in thinking the front diff is junk? Any other tests I can do to double check?
 

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