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As Tim already pointed out..... "limited slip" and "posi" mean exactly the same thing. Its a differential using a system of clutches and ramps that allows the rear wheels to move at different speeds when the car is going around a corner, and starts to tie the two axles together when one wheel starts to slip. Back in the ye olde days (when I was your age) Chevrolet trademarked their limited slip differential "Positraction"..... and from that point on, "posi" meant limited slip dfferential. Pontiac called the same thing Safe-T-Track, but their name never really caught on.
There are also limited slip diff's that use other means to tmeporarily tie the two axles together.... e.g. the Torsen unit that uses some cones.
I limited slip differential should lock both axles together when one of the them starts to slip. But because the clamping of the clutches is somewhat dependant on the torque being transmitted, you don't always see both wheels hooking at low loads. But under full throttle, the only way one wheel would slip was if the clutches are worn out.
Then there is a "locker"..... when one wheel starts to slip, it mechanically "locks" the two axles together, so both wheels transmit the power. Works similar to a limited slip, but can be a bit jerky, because its either fully on or fully off. And finally a "spool", which is a solid piece that splines to both axles and does not let the wheels ever turn at differnt speeds, which can be a bit of a problem on the street when you try and turn a corner.
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Fred
1994 Formula - 381ci / 300-shot N2O / TH400 / Gear Vendor OD / Strange 12-bolt 4.11 - 11.5@117 on straight motor
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