8 3/4 Rearends

Can Someone Enlighten Me On The Differences On 8 3/4 Cases.years,interchangability If Any,strenghts,weaknesses,advantages,disadvantages,spline Counts,availability Issues.also What Is A Cone Type Posi.as A Rock Crawler I Am Familiar With Spools And Lockers Of All Varities,and Understand Clutch Type Posis.any And All Info Is Appreciated.
Thank You!