I have a 1993 z28 withe the stock 3.23 gear ratios and I was wondering if it is posi-trac or limited slip. I have heard different things from different people and i was trying to find out if it's posi-trac without having to take the differential cover off.

 

They are one and the same. Check your RPO codes and G80 will list Limited Slip Rear. Posi-Trac or Positraction was Chevolets trade name for a Limited Slip in the 60's and the nick name never went away.

 

Just an added question, both limited slip and posi-trac would both be basically one wheel normal movement right? My 96 SS has definitely has posi rear, both rear wheels spin at the same time. I also have a 94 3.4L and I think it has what you would call posi-trac, single right side movement, unless it slips, then traction switches to the left side. Both camaros have limited slip, but when they slip they both act different. I'd just like a further explanation as to the difference, if any, between posi, posi-trac, and limited slip.

 

Read the first response..... "Posi-Traction" was a trade name that Chevrolet used back in the 1950's and 60's for a clutch-style limited slip differential. People shorted "Posi-Traction" to "Posi".

Posi-Traction = Posi = limited slip differential.

Pontiac called it "Safe-T-Trac", but that name never caught on.

GM had used a couple different types of limited slip units in the 4th Gens.... including a clutch type and the Torsen cone type, and maybe one or two others. SLP offered options for the differential in the SS, I believe.

 

Here's a link that proves helpful to GM owners.

http://www.drivetrain.com/GMtrkratio_posidata.html

Regards

 

No, your 3.4 has a normal open differential with no posi.

 

Just use the proper name Limited Slip rear and forget about calling it a Posi. Read some of the above Posts and see the dumb confusion.

 

GM uses the terms interchangeably.

Right out of the Factory Service Manual:

 

3rd & 4th Gen cars....RPO G80 Limited Slip Rear. No recent useage of the term Posi-Traction by Chevolet Motor Div. Note: the word RECENT.