I did watch some of the ET48.3 videos, but I was completely unaware of the Tekno ones with Lutz. They never came up in my search. I guess because I was looking specifically for EB48.3.

I'll have to check those out now before I go any further.

I already know I didn't use enough grease on the outdrives, so I'll probably end up rebuilding the diff's once I put it all together and make sure all the parts are ok.