Just in case you're interested (and apologies for butting in), but I have a spare manual AWD gearbox & bevel box that has been in the shed for many many years. I was going to do an auto>manual conversion of my old phase 1 V70R AWD - it was described as working perfectly and the bevels looked fine (at the time).
IIRC, it'd suit the 850 AWD and phase 1 V70 AWD.
Open to offers for it, but it'll need to be collected from Doncaster. PM me if you're interested