For a while I worked at ARB, the Australian 4WD accessory company. They have an air-actuated locker that goes from open to fully locked diff using a small on-board air compressor and internal air-actuated locking ring. THEY ARE AWESOME!!! They are "the thing" to have on a hard core 4x4 and when I was working with them, they introduces a 35 spline 9" unit for street-strip drag race guys. Very cool units.
The rest of the market OX-lock, Auburn, etc are all copies of this unit and use either electric or cable as the mechanism (since ARB has the int'l patents on the air locker design)
What would be the "ultimate" PT diff would be a unit where you could adjust the level of power distribution to the wheels, going from nearly an open diff to full lock. F1 has had this tech for years, it just hasn't trickled down yet.
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