Redline Oil Gurus: Subaru gear oil question

Okay, 'old' thread and all, but Red Line's 75W90NS product is the correct one for the manual transmission. It is also perfectly fine in the non-limited-slip rear diff. Use it in both. Or, go with Trav's suggestion of Castrol's Syntrax. That's built w/o the LSD friction modifiers, just like the Red Line 75W90NS product.