It's a Torsen Differential. It's actually a heavy-duty limited slip, so it needs resistance from both wheels to work. A wheel in the air has no resistance and will turn it into essentially an open differential. While they are on the ground and getting resistance from eash wheel as they are supposed to, they are basically the best limited slip available and work
extremely well (as it seems you mistook it for a locker

).
That 2:1 and 3:1 stuff is the bias ratio. I'm still a little fuzzy on exactly how that translates to applying torque, but I believe the higher numerically it is, the more torque it can transfer to the wheel with more traction. However you will always need 2 wheels touching the ground.
It's because there is a misunderstanding on how exactly a torsen does it's job.
a Torsen type I or Type II will be MORE prone to spinning
the inside tire in a corner than an open diff.
the blanket ASSumption that because a wheel is spinning the diff isn't working is the result of people not understanding the unit's function...
That "torque bias" figuire also states in a backwards sorta way how much the spinning tire can spin.
Provided that EITHER tire has SOME traction
Unlike an open differential it isn't allow to spin at ANY speed, but only at a very strictly defined ratio greater than the speed of the
other tire.
If you have one tire in the air it behaves like an open.
Though a technique of riding the brake a little
can keep the unit from allowing unlimited slip.
I recall not too long ago driving agressively in the rain and my passenger commented on "One legger burnouts" as I spun a wheel taking a corner (I run a conventional limited slip) it never occoured to them that BOTH rear tires were spinning and the one making the noise was the one with the greater traction, the one with less traction was spinning silently... but BOTH were spinning...
Shit, with a 4.10's and a 4.0 I can spin my 235's on dry pavement...
One of the reasons I'm switching to 3.73's.
Even with weight in the back my supercab is
a twitchy bastard in the snow.
If you really don't like it I'll trade you a new, never used
31-spline Ford Traction Loc for it.
AD