Faceplated 833 4 Speed
Actually dropping the cluster in the bottom IS an assembly procedure, "I've forgotten." I believe the 18 spline boxes require it, and the OD units. I recently assembled an OD box that was an oddball---A833 OD mated to a factory adapter to marry to a transfer case in a GM application.
I used a chuck of 5/8 heater hose for an arbor LOL