Thanks for the comment, lot's of others here have the same experience and are great resources. Learn new stuff almost every day here!
I've just run spools, Detroits, Auburns, Lincoln lockers, Ford Trac-locs and impatiently waited for ARB back in Feb 1987 telling me it would be about 6 months till they had the 31 spline 9" model out for their largest market share, the Ford 9". Well, it took them till the mid '90s to stuff that 31 spline unit in...and they had some upgrades immediately following. I finally bought my rear ARB in '95 to match my front one for my D44 from 1987. Night and Day for sidehilling in off camber conditions which we get here all winter...
I'd never run a Detroit again where I live, besides the fact that when an axle breaks or a ujoint grenades the Detroit usually explodes. Seen that happen all too often.