I just received this today and I want to make sure this is a real zexel torsion unit and not some other kind of posi unit.

 

Looks like a Torsion Limited SLIP and not a posi.

 

limited slip is posi. Positraction is just a name that pontiac sold to marketing for thier limited slip diffs. Like ram air and crap.

edit: Just to clarify. You have 3 types of diffs.

Open: If one wheel slips, it gets all the power.

Limited Slip/Posi: If one wheel slips, the other wheel gets a ratio of power. Either mechanical or electronic driven

Locked: Both wheels get power all the time.

 

So is it a zexel torsion?

 

It does look like a gear type limited slip so if no one else makes those, then yes, it's a Torsen.

 

great thanks!