Welcome to the forum.
I would remove the trans from the bottom but that is just me. I think it is possible to take the trans and engine out as one unit but I don't know if you can do it without a tilt bar. And I woudl most definately pull the transfer case out from the bottom.
When I put in my NV4500, I will attach the bellhousing to the engine and put that in as one unit and then raise the tranny up into place.
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