yes and no
All of the stock SC ones are that way and have traklok.
MarkVIII & Cobra also have 8.8 and the whole housing is aluminum.
The Mark doesn't come with traklok but both will fix our MN12s.
No "Posi" ever came in ANY Ford product. However Eaton does make an aftermarket "Posi" unit for the 8.8" Ford housing now. Trac-Loc is what SC's have (except as noted above).
A Trac-Loc does NOT hop the inside wheel in a turn. The clutch plates in the diff. allow each wheel to rotate at a different speed, once the bias pressure is overcome by the TQ difference from each wheel.
A Detroit Locker remains locked to each axle EXCEPT during the time that is actually ractheting. During that time, power is only applied to the axle that is still locked.