Many thanks to Sheriff420 and those who contributed to this thread. Last week I posted a video of this exact repair on Youtube, and it's probably worth watching for anybody considering doing the job. :

At the end of the second video, and in both video descriptions, I posted a shoutout to Sheriff420 and a link to this thread for those wanting to read further discussion. Cheers!

 

Great videos and perfect timing, I'll be pulling my transfer case and transmission next week. I'll be sure to check those seals while I'm in there.