Ok. so i have an 86 iroc with the stock posi in it. And i had it jacked up over the week end and tested it out. well it still spins both tire in the same direction when i turned it by hand. but when i have some one hold one tire still and i try to turn the other. the other person feels very little resistance in it. is my posi tired, does it need replaced? Or is this how the stock posi is?

My brother has a good auburn posi in his second gen and if i do the same with it both tires with move whether some on is holding the other or not. Is it just that much better than the stock posi units in our cars.

I know this question is a little hard to understand, i'm just not good saying what i'm thinking.

 

What is a Posi?????

 

You should also have an Auburn in your car. It is getting worn out, but is still good for now. When it starts leaving one black mark then it's time to replace it. Be prepared to do a complete rear end rebuild when that time comes so that you can clean out all of the metal in the rear end housing from the Auburn. When you replace it get an Eaton. This is a much better differential than the Auburn.

 

Thanks big gear head.

 

Posi and Positive Traction are Eaton's trade mark names for their limited slip differential. This is what was used in the '60s and '70s Chevy muscle cars. The name caught on so well that everybody uses the name POSI to describe all limited slip differentials now. The Auburn is actually a sure grip. Then there is the Traction Lock that has been used by Ford and GM for many years, and the Spicer Power Lock just to name a few. Most people just call all of these "posi".

 

At least you know where the term came from. When people talk about a LIMITED SLIP they should know to you the correct term and not show their ignorance on the subject.

One note to you, POSITRACTION was Chevrolet term for the limited slip in the 60's. The Eaton use came much later.

 

...really don't think there was any need for that...
lol this site is to learn information about our common interest... not to measure dicks

 

Thanks for that, really as long as the point get across whats the difference.