thanks andrew, i'll be sure to ask for some help when assembly starts
good news, my diff is getting built this coming week. went in last week to order my axles, and it seems my order did make last months shipment.
so my standard borg warner 8.5" diff will be equipped with
Moser billet 31 spline axles (standard R31 length, carries same bearing carrier), 5x114.3 stud pattern
Moser full spool centre
retaining the 3.89 auto diff ratio
diff itself gets stripped down, put in the acid bath for a day, then sent off to another local bloke to be etch primed and painted up. comes back, new seals, axles, centre, studs and bearings in and a new dose of oil