LSD units, even the torque biasing, helical drive units like Torsen and
Quiaff, will spin the inside rear driving wheel if it is off the ground.
Very few might be adjustable such that its closer to a locked rear end, but
still for most examples the rear tires have to be in contact with the ground
at least slightly, for the LSD unit to work.
If you run street tires, your grip won't be good enough for any tire to lift,
but with concrete and Hoosiers (as an example), even my car gets enough
traction to cause front AND rear tire lift.
Don Lew
DSP Supra
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