one wheel wonder
2.5:1 (or was it 2:1). The passenger side
lifts when you jerk it, loses its grip,
and your driver's side only gets 2.5X
the torque of the spinning passenger's
side. There's more than a 2.5:1 difference
between static and sliding friction, so it
never spins the driver's side.
Other "posi" types which are limited slip
(velocity split, not torque split) will spin
both tires more readily.
There are Torsen variants with larger max
split ratios, and there are ones with
preload springs that act more like a "posi".
But these are hard to find (only GM 10-bolt
vendor listed on www.torsen.com's distributor
page for GM is Global West; GW's page has
some nice technical pictures, but no sales
info (price).
However, your best acceleration comes just
before the onset of wheelspin, and if your
interest is speed more than smoke, you have
to learn and play with that threshold.

