I know you want an AWD set up, but wouldn't it be
much easier to find a FWD tranny out of an impreza or legacy. Saving a lot of work (Not saying it easy, just easier). I mean you have a rarer SVX with FWD, why not keep it special. I've yet to hear a SVX FWD 5 speed. I think it would be pretty original. It would make your SVX different from the rest. But its up to you, That's just me.