you could try thes guy down here in OZ they do one for a toyota diff as well.
http://www.marks4wd.com/portal-axles/nissan.html
http://www.marks4wd.com/portal-axles/nissan.html
Portal axle info.
- Thread starter morgan85
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The Nissan ones are around AUD$15K, but I think the Landcriuser version costs over AUD$20K. Something to do with having to fit a transmission handbrake and new swivel hubs. Can't find the link for the price, but I know they built a 105 with LS3 + 6L80 and portals.
This link talks about both Nissan & Landcruiser portals: http://www.marks4wd.com/media/downloads/10/4x4_Australia_-_Portal_Axles.pdf