I have a 3 series 30 spline early Dana 60 posi I have never taken apart, I'm thinking they came with the two piece interior posi parts like the 12.17 and 23 spline posi came with stock shruggy
I'll try and remember to dig it out tomorrow and look inside to see if I can tell if the side gears are one piece or two piece confused
Maybe call Cass either way to check if he can help you on this or not scope

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)