I did a lot of research and decided on this:
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It's here:
http://www.germanautoparts.com/productdisplay/123039though, I bought off eBay for an overall better deal.
Also, this is in litre bottles, and you only need two.
Spendy oil, but the shifting of the T case is definitely improved, and after running the dunes this past weekend plus all the highway driving I was happy to notice a more comfortably warm felt temperature on the handle/boot area.
I had to do something, and once my research was complete I realized that I had GL-5 oil in the case and felt that I had to get that poison out of there. It's the deterioration on yellow metals caused by the GL-5 formulation which is the concern, and these boxes have synchros.
Up to 90 weight in scorching hot climates. I'd not consider Bend, OR torrid, so 80 weight seems reasonable.
This oil I chose is a base 75, sure, which in sub freezing temps here will be nice. When the heat rises a bit the VI improvers will bring the oil to an 80 weight, as the factory specified.
My .02