Originally Posted by 4jfarmer
it was a debate on my part to go with posi trac or limited slip
Do you mean you were debating between a limited slip and a locker?
a limited slip.
It's just what GM called their l/s setup. Ford calls it the Trac-Loc, Mopar version was a Sure-Grip. Yukon calls theirs the Dura-Grip.
They are all forms of a limited slip differential - they just gets the job done by slightly different means, but provide the same general benefits that all limited slips do.
Now a locker is a different animal from a l/s and is better for those more difficult off-road situations.