8-3/4 spool

a fellow i know wants to run a spool in his 8-3/4 diff -- i told him it will not work with the stock tapered axle bearings ( no thrust block ) -- you have to convert your axles to the Green roller bearing -- i also stated you should not use a spool with stock axles ,,, but again i lost.
so let's here from this forum and i will direct him here to read the replies.
thanks