The tailcone is held to the transfer case by three bolts. Two of them are marked in the picture. I'm sure you can find the third one on your transfer case. Remove them.

The tailcone should pop/slide off the case/shaft. If not, lightly tap it on the sides with a hammer to nudge it free from the case. The only thing holding it in place at this time is silicone sealant.

The transfer case will look like this with the tailcone removed.