As I understand/interpret it:
FAB
One-way layshaft that can be adjusted from fully locked (no one-way action) to loose (full one-way action). Can be used to reduce the amount of braking vs Full diff or offer additional stability/reduce free-wheeling under braking vs one-way. Full front diff action under power.
One way layshaft
No braking force transmitted to front end (free-wheels off power). Full front diff action under power.
One way "diff"
Spool pulley with one-way bearing. No braking force transmitted to front end. Both wheels pull simultaneously under power, no diff action.
Full diff
No one-way action off power, full braking force transmitted to front wheels. Full front diff action under power.
Could be wrong tho....
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