I removed the rear driveshaft, put it into 4HI (and 4LO for the matter), put the tranny into drive; the car didn't want to move, so I got out and looked underneath, the driveshaft does spin.

I shut it off and went about checking all of the vacuum lines, no cracks or splits or disconnected lines. I found the vacuum canister and it is still sealed.

What else do you recommend I check? My friend told me to take the wheels off because I may have manual hubs or my auto hubs aren't locking.

 

You don't have locking hubs. Your axles are always locked to your wheels.

You apparently have vacuum disconnect. I'd start the Jeep, switch to 4wd (With the Jeep in park) then climb under there and see if you have vacuum on the lines to the disconnect.

The second thing I'd do I buy a block off place and install a 1-piece shaft to do away with that feature.

 

Alright I will try that at home. So if I do have vacuum, that means that actuator is bad?

 

Notorious failure point. Just do this and be done with it:


https://www.cherokeeforum.com/f51/fr...ss-91-a-38629/

 

I checked for vacuum, all of the lines except for the green one has vacuum to them. Where does the green one go to?

 

Here. If you insist on keeping that unreliable POS system that will surely fail you when you need it the most:

 

you have the electric wire or all vacuum lines theres a switch on transfercase that switchs vacuum to lock and unlock . when you switch to 4wd does vacuum supply switch lines at axle disconnect ?

 

Here's why my 4x4 wasn't kicking:

Who would have thought the shift fork was broken?