[imperialexpress]

Pretty odd. When I removed my transfer case, after removing those six nuts the case came out pretty easily. I understand your frustration but I'd be careful to not damage the transmission as you remove this old transfer case.

As someone already mentioned, the case should only be held on by the splines in the transmission at this point. Could try taking a hammer to the spot I marked or using the air hammer against the ridges of the transfer case. I'd avoid the part where the case meets the transmission, don't want to mar up that surface.

Post up some pictures and we may be able to provide better suggestions.

 

[imperialexpress]

Thank you. Will get some photos up tomorrow, I don't have any helpful ones on hand and it's dark.

It does seem that, based on what you've tried, there is something mechanically preventing the transfer case from being removed. You may need to start disassembling the transfercase and see what, if anything, is preventing its removal.