Welcome to the Nissan Patrol forum. To post a question and to see less adds on the forum then you will have to register
first. We are an easy going friendly forum so join in the conversations and feel free to ask any questions.
Become a forum sponsor for only $20 and see no adds with faster page loading times and many extras benefits.
The patrol isn't high enough to get the box out mate. You could put it on ramps or jack stands.
In a home garage situation I have done a few from using a trolley jack to an engine crane. I found the engine crane worked quite well. With the use of a soft sling you put the crane in through one of the front doors and raise and lower as you please and using a soft sling allows you to be able to rotate it enough to remove and install.
I have also removed the transfer but found it took a little longer as it is quite awkward to remove and install even by itself. However it did make box removal slightly easier as the box doesn't want to fall one way. Although with the engine crane and soft sling used in a choke fashion it can't roll anyway.
I have easily done it in a day and a half at home so if you had all the right gear and some helpful friends should have it done in a weekend.